Support FastTrackUploading for YUV images

Support FastTrackUploading for YUV images

Let we support YUV image case without additional image loading
or image operation.

Instead, let we think that FastTrackUploading will use
YUV format always if DALI_LOAD_IMAGE_YUV_PLANES=1.
And then, revert as standard shader if we are not use
YUV case actually.

To support this feature. let we make unified YUV + RGB shader can use
standard rgb image color for special case.
After load completed, we can determine the type of shader.

Change-Id: Ia4ffa288e705af751e722cd1440de2a014ad19b4
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>