hwaccess_physmap: add missing DirectHW include

For MACH / APPLE map_physical is defined in DirectHW.h

TEST: run `make`
  compiles,
  linking fails due to missing directhw object in my setup, don't know
  how to fix this

Change-Id: I0e0f3fd587ae46e6f73418f2c83641cb1202478c
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/62929
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72314
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/hwaccess_physmap.c b/hwaccess_physmap.c
index 8ea05cf..5644680 100644
--- a/hwaccess_physmap.c
+++ b/hwaccess_physmap.c
@@ -133,6 +133,7 @@
 {
 }
 #elif defined(__MACH__) && defined(__APPLE__)
+#include <DirectHW/DirectHW.h>
 
 #define MEM_DEV "DirectHW"