arch/io.h: Drop unnecessary include

Change-Id: I91158452680586ac676ea11c8589062880a31f91
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31692
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/elog/gsmi.c

@@ -13,7 +13,6 @@
  * GNU General Public License for more details.
  */
 
-#include <arch/io.h>
 #include <console/console.h>
 #include <cpu/x86/smm.h>
 #include <elog.h>