share/mk: Remove armv6 support

It is being removed from the tree. Remove the build infrastructure to
configure armv6 builds.

Reviewed by:	manu, imp, emaste
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D45643

share/mk/bsd.cpu.mk

@@ -315,13 +315,10 @@ MACHINE_CPU = riscv
 ########## arm
 .if ${MACHINE_CPUARCH} == "arm"
 MACHINE_CPU += arm
-. if ${MACHINE_ARCH:Marmv6*} != ""
-MACHINE_CPU += armv6
-. endif
 . if ${MACHINE_ARCH:Marmv7*} != ""
 MACHINE_CPU += armv7
 . endif
-# Normally armv6 and armv7 are hard float ABI from FreeBSD 11 onwards. However
+# Normally armv7 is hard float ABI from FreeBSD 11 onwards. However
 # when CPUTYPE has 'soft' in it, we use the soft-float ABI to allow building of
 # soft-float ABI libraries. In this case, we have to add the -mfloat-abi=softfp
 # to force that.

share/mk/bsd.opts.mk

@@ -95,7 +95,7 @@ __DEFAULT_DEPENDENT_OPTIONS = \
 # means that ASLR is of limited effectiveness, and it may cause issues with
 # some memory-hungry workloads.
 #
-.if ${MACHINE_ARCH} == "armv6" || ${MACHINE_ARCH} == "armv7" \
+.if ${MACHINE_ARCH} == "armv7" \
     || ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "powerpc" \
     || ${MACHINE_ARCH} == "powerpcspe"
 __DEFAULT_NO_OPTIONS+= PIE