hwaccess physmap: move x86 msr related code into own files

Allow x86 msr related code to be compiled independent from memory
mapping functionality. This enables for a better selection of needed
hardware access types.

flashrom-stable: Squashed fixup for FreeBSD

Change-Id: Idc9ce9df3ea1e291ad469de59467646b294119c4
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/60111
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72266
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/meson.build b/meson.build
index a731bcf..4db878b 100644
--- a/meson.build
+++ b/meson.build
@@ -332,6 +332,7 @@
 if need_raw_access
   srcs += 'hwaccess.c'
   srcs += 'hwaccess_x86_io.c'
+  srcs += 'hwaccess_x86_msr.c'
   srcs += 'physmap.c'
   cargs += '-DNEED_RAW_ACCESS=1'
   cargs += '-D__FLASHROM_HAVE_OUTB__=1'