HWC2: Hook up setColorTransform/setLayerDataspace

Plumbs the setColorTransform and setLayerDataspace calls through the
HWC2 C++ shim and implements a trivial versions in the adapter,
which drops non-HAL_DATASPACE_UNKNOWN layers to client composition,
and which drops all layers to client composition if a color transform
is applied.

Bug: 22767098
Change-Id: Ifffd19b77cf3b33ec86fde3f72257f6b97b4dd79