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/cbtable.c b/cbtable.c
index d3106a3..660b487 100644
--- a/cbtable.c
+++ b/cbtable.c
@@ -26,6 +26,7 @@
 #include "flash.h"
 #include "programmer.h"
 #include "coreboot_tables.h"
+#include "hwaccess_physmap.h"
 
 static char *cb_vendor = NULL, *cb_model = NULL;