hwaccess: move x86 port I/O related code into own files

Allow port I/O related code to be compiled independent from memory
mapping functionality. This enables for a better selection of needed
hardware access types.

Change-Id: I372b4a409f036da766c42bc406b596bc41b0f75a
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/60110
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72265
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/hwaccess_x86_io.h b/hwaccess_x86_io.h
index 63692b8..0d16fdd 100644
--- a/hwaccess_x86_io.h
+++ b/hwaccess_x86_io.h
@@ -29,8 +29,6 @@
 #include <sys/io.h>
 #endif
 
-#define __FLASHROM_HAVE_OUTB__ 1
-
 /* for iopl and outb under Solaris */
 #if defined (__sun)
 #include <sys/sysi86.h>
@@ -38,6 +36,8 @@
 #include <asm/sunddi.h>
 #endif
 
+int rget_io_perms(void);
+
 /* Clarification about OUTB/OUTW/OUTL argument order:
  * OUT[BWL](val, port)
  */