hwc: Listen fb0 event for panel status

Listen fb0 status change event for panel status. fb0 will receive
"PANEL_ALIVE=0" when panel is not responding to status call.
Call blank and unblank to reset the panel in next hwc_prepare
call.

Change-Id: I941a501a82d9f3b725660ad09631c1d8602b7325
diff --git a/libhwcomposer/hwc_utils.h b/libhwcomposer/hwc_utils.h
index d281fb0..1f1953b 100644
--- a/libhwcomposer/hwc_utils.h
+++ b/libhwcomposer/hwc_utils.h
@@ -427,6 +427,9 @@
     bool mBufferMirrorMode;
 
     qhwc::LayerRotMap *mLayerRotMap[HWC_NUM_DISPLAY_TYPES];
+
+    // Panel reset flag will be set if BTA check fails
+    bool mPanelResetStatus;
 };
 
 namespace qhwc {