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

Include the file containing the typedefs for uint_*.

Change-Id: Ib0eea9bfd0c8d9e3eba257b561980accf5b4bab4
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35267
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -18,6 +18,7 @@
 #define __CALLOUTS_AMD_AGESA_H__
 
 #include <amdblocks/agesawrapper.h>
+#include <stdint.h>
 
 #define BIOS_HEAP_SIZE			0x30000
 #define BSP_STACK_BASE_ADDR		0x30000