GENIO: media: i2c: max9286: Fix the chan amplitude source from DTS

The amplitude of reverse channel should be the larger of the DTS
settings and the default value (MAX9286_REV_AMP_HIGH)

Change-Id: Icb346dba8d03e56bd7e66b0c6545ec725da66ce1
Signed-off-by: RyanHsiao <ryan.hsiao@mediatek.com>

drivers/media/i2c/max9286.c

@@ -573,7 +573,7 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
 	 * - Disable auto-ack as communication on the control channel are now
 	 *   stable.
 	 */
-	max9286_reverse_channel_setup(priv, MAX9286_REV_AMP_HIGH);
+	max9286_reverse_channel_setup(priv, max(priv->init_rev_chan_mv, MAX9286_REV_AMP_HIGH));
 	max9286_check_config_link(priv, priv->source_mask);
 	max9286_configure_i2c(priv, false);