sf: Allow WFD to use hwc in vendor frozen targets

Change-Id: Iecd2be3eb8775855d82763f069a38bb70fe53d4e
CRs-Fixed: 3229968
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 3cb2274..7c2d164 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -1503,6 +1503,7 @@
 
     bool mAllowHwcForVDS = false;
     bool mAllowHwcForWFD = false;
+    int mFirstApiLevel = 0;
 
     // returns the framerate of the layer with the given sequence ID
     float getLayerFramerate(nsecs_t now, int32_t id) const {