Use envvar rather than nonstandard hint. lines

The NOTES files have a bunch of hint lines that are removed when
generating LINT. However, we can achieve the same effect by prepending
each of the lines with 'envvar' so the NOTES files become standard
config(8) files. No functional changes as the sed script to generate
the LINT files filters these either way.

Suggested by: kevans

sys/i386/conf/NOTES

@@ -273,8 +273,8 @@ device		nvram		# Access to rtc cmos via /dev/nvram
 # MISCELLANEOUS DEVICES AND OPTIONS
 
 device		speaker		#Play IBM BASIC-style noises out your speaker
-hint.speaker.0.at="isa"
-hint.speaker.0.port="0x61"
+envvar		hint.speaker.0.at="isa"
+envvar		hint.speaker.0.port="0x61"
 device		apm_saver	# Requires APM
 
 
@@ -342,8 +342,8 @@ options 	X86BIOS
 
 #
 # Hints for the non-optional Numeric Processing eXtension driver.
-hint.npx.0.flags="0x0"
-hint.npx.0.irq="13"
+envvar		hint.npx.0.flags="0x0"
+envvar		hint.npx.0.irq="13"
 
 #
 # `flags' for npx0:
@@ -369,8 +369,8 @@ hint.npx.0.irq="13"
 
 # PS/2 mouse
 device		psm
-hint.psm.0.at="atkbdc"
-hint.psm.0.irq="12"
+envvar		hint.psm.0.at="atkbdc"
+envvar		hint.psm.0.irq="12"
 
 # Options for psm:
 options 	PSM_HOOKRESUME		#hook the system resume event, useful
@@ -379,13 +379,13 @@ options 	PSM_RESETAFTERSUSPEND	#reset the device at the resume event
 
 # The keyboard controller; it controls the keyboard and the PS/2 mouse.
 device		atkbdc
-hint.atkbdc.0.at="isa"
-hint.atkbdc.0.port="0x060"
+envvar		hint.atkbdc.0.at="isa"
+envvar		hint.atkbdc.0.port="0x060"
 
 # The AT keyboard
 device		atkbd
-hint.atkbd.0.at="atkbdc"
-hint.atkbd.0.irq="1"
+envvar		hint.atkbd.0.at="atkbdc"
+envvar		hint.atkbd.0.irq="1"
 
 # Options for atkbd:
 options 	ATKBD_DFLT_KEYMAP	# specify the built-in keymap
@@ -400,7 +400,7 @@ makeoptions	ATKBD_DFLT_KEYMAP=fr.dvorak
 
 # Video card driver for VGA adapters.
 device		vga
-hint.vga.0.at="isa"
+envvar		hint.vga.0.at="isa"
 
 # Options for vga:
 # Try the following option if the mouse pointer is not drawn correctly
@@ -521,34 +521,34 @@ device		cpufreq
 device          bxe             # Broadcom NetXtreme II BCM5771X/BCM578XX 10GbE
 device		ce
 device		cp
-hint.cs.0.at="isa"
-hint.cs.0.port="0x300"
+envvar		hint.cs.0.at="isa"
+envvar		hint.cs.0.port="0x300"
 #options 	NETGRAPH_CRONYX		# Enable NETGRAPH support for Cronyx adapter(s)
 options 	ED_3C503
 options 	ED_HPP
 options 	ED_SIC
-hint.ed.0.at="isa"
-hint.ed.0.port="0x280"
-hint.ed.0.irq="5"
-hint.ed.0.maddr="0xd8000"
+envvar		hint.ed.0.at="isa"
+envvar		hint.ed.0.port="0x280"
+envvar		hint.ed.0.irq="5"
+envvar		hint.ed.0.maddr="0xd8000"
 device		ipw		# Intel 2100 wireless NICs.
 device		iwi		# Intel 2200BG/2225BG/2915ABG wireless NICs.
 device		iwn		# Intel 4965/1000/5000/6000 wireless NICs.
 # Hint for the i386-only ISA front-end of le(4).
-hint.le.0.at="isa"
-hint.le.0.port="0x280"
-hint.le.0.irq="10"
-hint.le.0.drq="0"
+envvar		hint.le.0.at="isa"
+envvar		hint.le.0.port="0x280"
+envvar		hint.le.0.irq="10"
+envvar		hint.le.0.drq="0"
 device  	mthca		# Mellanox HCA InfiniBand
 device		mlx4		# Shared code module between IB and Ethernet
 device  	mlx4ib		# Mellanox ConnectX HCA InfiniBand
 device  	mlx4en		# Mellanox ConnectX HCA Ethernet
 device		nfe		# nVidia nForce MCP on-board Ethernet
 device		sbni
-hint.sbni.0.at="isa"
-hint.sbni.0.port="0x210"
-hint.sbni.0.irq="0xefdead"
-hint.sbni.0.flags="0"
+envvar		hint.sbni.0.at="isa"
+envvar		hint.sbni.0.port="0x210"
+envvar		hint.sbni.0.irq="0xefdead"
+envvar		hint.sbni.0.flags="0"
 device		vmx		# VMware VMXNET3 Ethernet
 device		wpi		# Intel 3945ABG wireless NICs.
 
@@ -762,14 +762,14 @@ device 		hyperv		# HyperV drivers
 #  of the Vaio extra features are controlled by this device.
 
 device		apm
-hint.apm.0.flags="0x20"
+envvar		hint.apm.0.flags="0x20"
 device		ipmi
 device		smapi
 device		smbios
 device		vpd
 device		pbio
-hint.pbio.0.at="isa"
-hint.pbio.0.port="0x360"
+envvar		hint.pbio.0.at="isa"
+envvar		hint.pbio.0.port="0x360"
 device		asmc
 device		tpm
 device		padlock_rng	# VIA Padlock RNG
@@ -797,9 +797,9 @@ options 	POWERFAIL_NMI	# make it beep instead of panicing
 # pcf	Philips PCF8584 ISA-bus controller
 #
 device		pcf
-hint.pcf.0.at="isa"
-hint.pcf.0.port="0x320"
-hint.pcf.0.irq="5"
+envvar		hint.pcf.0.at="isa"
+envvar		hint.pcf.0.port="0x320"
+envvar		hint.pcf.0.irq="5"
 
 #
 # Hardware watchdog timers: