Add simplistic implementations for SetColorTransform and SetLayerColor

Several VTS testcases for VtsHalGraphicsComposerV2_1Target fails since required functions (SetColorTransform and SetLayerColor) is marked as unsupported by drm_hwcomposer. We can't make complete implementation of those features for our platform for now, so this is acceptable way to pass tests for us.

Commit da5839cf ("drm_hwcomposer: Add support for GetColorModes & SetCursorPosition") implements GetColorModes and SetCursorPosition simply by adding fields that store this values for future uses. Therefore we assume that it is okay to use this approach to at least support interface part.

This MR fixes two testcases, for SET_COLOR_TRANSFORM and SET_LAYER_COLOR. VTS test results before changes for our case:

Module Passed Failed Total Tests
arm64-v8a VtsHalGraphicsComposerV2_1Target 31 22 53
armeabi-v7a VtsHalGraphicsComposerV2_1Target 31 22 53

VTS tests after adding simplistic implementation:

Module Passed Failed Total Tests
arm64-v8a VtsHalGraphicsComposerV2_1Target 33 20 53
armeabi-v7a VtsHalGraphicsComposerV2_1Target 33 20 53
Edited by Roman Kovalivskyi

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