hwc: Invalidate on receiving PANEL_ALIVE=0 status

Invalidate on receiving PANEL_ALIVE=0 status, otherwise
during static wallpaper, panel will be reset only after
next screen update.

Change-Id: I6f5264367c8bd889b9103ed74641ac4a60538b57
CRs-Fixed: 591454
diff --git a/libhwcomposer/hwc_uevents.cpp b/libhwcomposer/hwc_uevents.cpp
index 10afc92..51e5526 100644
--- a/libhwcomposer/hwc_uevents.cpp
+++ b/libhwcomposer/hwc_uevents.cpp
@@ -121,6 +121,7 @@
 {
     bool bpanelReset = getPanelResetStatus(ctx, udata, len);
     if (bpanelReset) {
+        ctx->proc->invalidate(ctx->proc);
         return;
     }