soc/amd/common: Add missing stdint.h to acpimmio.h

Include the file containing the typedefs for uint_*.

Change-Id: I3eae80a677e9d6932dc115523da2c0819a371fa7
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35268
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/include/amdblocks/acpimmio.h

@@ -18,6 +18,7 @@
 #ifndef __AMDBLOCKS_ACPIMMIO_H__
 #define __AMDBLOCKS_ACPIMMIO_H__
 
+#include <stdint.h>
 /* iomap.h must indicate if the device uses a block, optional if unused. */
 #include <soc/iomap.h>
 #ifndef SUPPORTS_ACPIMMIO_SMI_BASE