drm/komeda: Add drm_ctm_to_coeffs()

This function is for converting drm_color_ctm matrix to komeda hardware
required required Q2.12 2's complement CSC matrix.

v2:
Move the fixpoint conversion function s31_32_to_q2_12() to drm core
as a shared helper.

Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Mihail Atanassov <mihail.atanassov@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191112110927.20931-4-james.qian.wang@arm.com

drm/komeda: Add drm_lut_to_fgamma_coeffs()

This function is used to convert drm color lut to komeda HW required curve
coeffs values.

Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Mihail Atanassov <mihail.atanassov@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191112110927.20931-3-james.qian.wang@arm.com

drm/komeda: Enable color-encoding (YUV format) support

Adds color-encoding properties if layer can support YUV format.
Updates HW YUV-RGB matrix state according to the color-encoding
properties.

Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
Reviewed-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>