libpayload: hexdump: Use `p` as conversion specifier for pointers

Change-Id: Ie5c279ef90bd9ed5e2624bf852dcff1f06531a13
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/4767
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

payloads/libpayload/libc/hexdump.c

@@ -49,7 +49,7 @@ void hexdump(const void *memory, size_t length)
 		}
 
 		if (all_zero < 2) {
-			printf("%08lx:", memory + i);
+			printf("%8p:", memory + i);
 			for (j = 0; j < 16; j++)
 				printf(" %02x", m[i + j]);
 			printf("  ");