usb: msm_otg: add charger notify API

add charger notify API from msm_otg for abnormal pluged external charger

Change-Id: I50d39ca31f2878844dc4cbdefce789d481a26a7f
diff --git a/drivers/usb/otg/msm_otg.c b/drivers/usb/otg/msm_otg.c
index 3e3b38e..83ad8b0 100644
--- a/drivers/usb/otg/msm_otg.c
+++ b/drivers/usb/otg/msm_otg.c
@@ -2220,6 +2220,8 @@
 						OTG_STATE_B_PERIPHERAL;
 					break;
 				case USB_SDP_CHARGER:
+					msm_otg_notify_charger(motg,
+							IDEV_CHG_MIN);
 					msm_otg_start_peripheral(otg, 1);
 					otg->phy->state =
 						OTG_STATE_B_PERIPHERAL;