hwaccess.h: Split hwaccess.h and extract hwaccess_x86_io.h out of it

The change makes it possible to mock functions from hwaccess_x86_io.h
in tests by replacing this header with a different one when built
for a test environment. The rest of hwaccess.h is fine and works
for the test environment.

BUG=b:181803212
TEST=make clean && make CONFIG_EVERYTHING=yes VERSION=none
Build flashrom before and after this patch, flashrom binary
is the same (diff flashrom_before flashrom_after shows no diffs)

Change-Id: Idd04c7b36b24e9da339348a015df4f43a03744f7
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/52499
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
2 files changed