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/soc/intel/quark/include/soc/reg_access.h

@@ -16,7 +16,6 @@
 #ifndef _QUARK_REG_ACCESS_H_
 #define _QUARK_REG_ACCESS_H_
 
-#include <arch/io.h>
 #include <cpu/x86/cr.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mtrr.h>