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Introduce support for rockchip gamma table, Rockchip have two version gamma table design: The old version design was introduced by Dominik Behr's gamma patch (https://chromium-review.googlesource.com/272209): Gamma table has to be uploaded when the LUT is disabled which only takes effect at the end of a frame, therefore actual hardware updates is done from a worker and can take more than one frame. In order to solve gamma table switch issues, after rk3399, H/W add a gamma table update mechanism, can update without lut disable. And gamma table's size also has two version: one is 10 bit per component, 1024 entries, the other one is 8 bit per component, 256 entries Change-Id: I8145d1c42a28d57f11e95d24be2341011360334d Signed-off-by: Dominik Behr <dbehr@chromium.org> Signed-off-by: Mark Yao <mark.yao@rock-chips.com>