physmap: rename to hwaccess_physmap, create own header

Line up physmap with the other hwaccess related code.

Change-Id: Ieba6f4e94cfc3e668fcb8b3c978de5908aed2592
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/60113
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72267
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/flashrom.c b/flashrom.c
index ccc7132..03457d3 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -38,6 +38,7 @@
 #include "flashchips.h"
 #include "programmer.h"
 #include "hwaccess.h"
+#include "hwaccess_physmap.h"
 #include "chipdrivers.h"
 
 const char flashrom_version[] = FLASHROM_VERSION;