kernel: panel_notifier: Add new panel notify event type

panel_notifier:
Add new panel notify event type, after panel reset, before
sending panel on init commands.

Change-Id: I9cc37530ca610060fd122da52bd2edba995ceee4
Signed-off-by: wangyq13 <wangyq13@lenovo.com>
Reviewed-on: https://gerrit.mot.com/1651425
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Dezhen Hou <houdz1@motorola.com>
Submit-Approved: Jira Key

include/linux/panel_notifier.h

@@ -21,6 +21,7 @@ enum panel_event {
 	PANEL_EVENT_PRE_DISPLAY_ON,
 	PANEL_EVENT_DISPLAY_OFF,
 	PANEL_EVENT_DISPLAY_ON,
+	PANEL_EVENT_DISPLAY_ON_PREPARE,
 };
 
 #ifdef CONFIG_PANEL_NOTIFICATIONS