util/inteltool: use read* macros instead of pointers

Switch to using read* macros instead of pointers.

Change-Id: I1fe54b496a5998597b79cdd7108f3a4075744a78
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39503
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/inteltool/inteltool.h

@@ -17,6 +17,7 @@
 #ifndef INTELTOOL_H
 #define INTELTOOL_H 1
 
+#include <arch/mmio.h>
 #include <commonlib/helpers.h>
 
 #include <stdint.h>