Add connect calls for SurfaceTexture. Clean PreviewRenderer.

Now connect() is necessary for SurfaceTexture.
Also cleaned unused code in PreviewRenderer.

Change-Id: Ic49df01e79f38a48a8c2cf194d13ee575660c834
diff --git a/libvideoeditor/lvpp/NativeWindowRenderer.cpp b/libvideoeditor/lvpp/NativeWindowRenderer.cpp
index 23d9506..854062e 100755
--- a/libvideoeditor/lvpp/NativeWindowRenderer.cpp
+++ b/libvideoeditor/lvpp/NativeWindowRenderer.cpp
@@ -572,6 +572,9 @@
     : mRenderer(renderer)
     , mTextureId(textureId) {
     mST = new SurfaceTexture(mTextureId);
+    uint32_t outWidth, outHeight, outTransform;
+    mST->connect(NATIVE_WINDOW_API_MEDIA, &outWidth, &outHeight, &outTransform);
+
     mSTC = new SurfaceTextureClient(mST);
 }