drm/sti: add colorspace property to the HDMI connector

Make the value of the colorspace of the HDMI infoframe configurable.
HDMI colorspace could be: RGB, YUV422 or YUV444

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
2 files changed