mailbox: bcm-pdc: Use octal permissions rather than symbolic

When creating the debugfs files for the PDC driver, use
octal file permissions rather than symbolic file permissions.
Signed-off-by: NRob Rice <rob.rice@broadcom.com>
Reviewed-by: NAndy Gospodarek <gospo@broadcom.com>
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/bcm-pdc-mailbox.c

@@ -480,7 +480,8 @@ static void pdc_setup_debugfs(struct pdc_state *pdcs)
 	if (!debugfs_dir)
 		debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 
-	pdcs->debugfs_stats = debugfs_create_file(spu_stats_name, S_IRUSR,
+	/* S_IRUSR == 0400 */
+	pdcs->debugfs_stats = debugfs_create_file(spu_stats_name, 0400,
 						  debugfs_dir, pdcs,
 						  &pdc_debugfs_stats);
 }