Command for accessing serial flash update

Change strtoul number base of argv 3 from 0 to 16

Signed-off-by: TsiChung Liew <tsicliew@gmail.com>

common/cmd_sf.c

@@ -48,7 +48,7 @@ static int do_spi_flash_probe(int argc, char *argv[])
 			goto usage;
 	}
 	if (argc >= 4) {
-		mode = simple_strtoul(argv[3], &endp, 0);
+		mode = simple_strtoul(argv[3], &endp, 16);
 		if (*argv[3] == 0 || *endp != 0)
 			goto usage;
 	}