drm/display: hdmi-state-helper: Act on color format DRM property

With the introduction of the "color format" DRM property, which allows
userspace to request a specific color format, the HDMI state helper
should implement this.

Implement it by translating the requested drm_connector_color_format to
a drm_output_color_format enum value as per the logic HDMI should use
for this: Auto is translated to RGB, and a fallback to YUV420 is only
performed if the original color format was auto.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Link: https://patch.msgid.link/20260609-color-format-v17-8-35739b5782cc@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>

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