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/ichspi.c b/ichspi.c
index 6777425..9d04d8b 100644
--- a/ichspi.c
+++ b/ichspi.c
@@ -25,6 +25,7 @@
 #include "flash.h"
 #include "programmer.h"
 #include "hwaccess.h"
+#include "hwaccess_physmap.h"
 #include "spi.h"
 #include "ich_descriptors.h"