soc/amd/picasso/include/soc/memmap.c: Add missing <stdint.h>

include <stdint.h> for 'uint32_t'.

Change-Id: I8768b7f0692ed703a060dc0406b517dc001cc25d
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42338
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/amd/picasso/include/soc/memmap.h

@@ -3,6 +3,7 @@
 #ifndef __SOC_AMD_PICASSO_MEMMAP_H__
 #define __SOC_AMD_PICASSO_MEMMAP_H__
 
+#include <stdint.h>
 #include <symbols.h>
 
 DECLARE_REGION(early_reserved_dram)