Fix uninitialized member warning

The fact that mHasDeferredTranslate was unitialized couldn't cause any
problems, since mTranslateX and mTranslateY are intialized to zero and
the only use of mHasDeferredTranslate, in
DisplayListRenderer::flushTranslate(), doesn't do anything if those
values are both zero and then sets mHasDeferredTranslate to false.

Change-Id: Ia5aa2590b3ab956eaf74c90515353600253873f5
diff --git a/libs/hwui/DisplayListRenderer.cpp b/libs/hwui/DisplayListRenderer.cpp
index f5247e7..916e916 100644
--- a/libs/hwui/DisplayListRenderer.cpp
+++ b/libs/hwui/DisplayListRenderer.cpp
@@ -38,6 +38,7 @@
     , mDisplayListData(NULL)
     , mTranslateX(0.0f)
     , mTranslateY(0.0f)
+    , mHasDeferredTranslate(false)
     , mDeferredBarrierType(kBarrier_None)
     , mHighContrastText(false)
     , mOverrideXfermode(-1)