pmap_mapdev: Consistently use vm_paddr_t for the first argument.

The devmap variants used vm_offset_t for some reason, and a few places
explicitly cast bus addresses to vm_offset_t.  (Probably those casts
along with similar casts for vm_size_t should just be removed and
instead permit the compiler to DTRT.)

Reviewed by:	markj
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D35961

sys/arm/arm/nexus.c

@@ -363,7 +363,7 @@ nexus_activate_resource(device_t bus, device_t child, int type, int rid,
 		}
 		rman_set_bustag(r, fdtbus_bs_tag);
 #else
-		vaddr = (bus_space_handle_t)pmap_mapdev((vm_offset_t)paddr,
+		vaddr = (bus_space_handle_t)pmap_mapdev((vm_paddr_t)paddr,
 		    (vm_size_t)psize);
 		if (vaddr == 0) {
 			rman_deactivate_resource(r);

sys/arm/freescale/fsl_ocotp.c

@@ -81,7 +81,7 @@ fsl_ocotp_devmap(void)
 
 	ocotp_size = (vm_size_t)size;
 
-	if ((ocotp_regs = pmap_mapdev((vm_offset_t)base, ocotp_size)) == NULL)
+	if ((ocotp_regs = pmap_mapdev((vm_paddr_t)base, ocotp_size)) == NULL)
 		goto fatal;
 
 	return;