part: rkparm: update message don't print by default

The print "invalid parameter" is confused, make it clear to show this is
a warning from RKPARM partition table.

Change-Id: I1381dd6e60d963f1f233d08c8527495b6ca6101c
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

disk/part_rkparm.c

@@ -40,7 +40,7 @@ static int rkparm_param_parse(char *param, struct list_head *parts_head,
 	unsigned long size, start;
 
 	if (!cmdline) {
-		printf("invalid parameter\n");
+		debug("RKPARM: Invalid parameter part table\n");
 		return -EINVAL;
 	}