drm/rockchip: dw_hdmi: Propagate bus format to display driver

The HDMI block is currently hardcoded to expect RGB output from the
display controller. However, the VOP in some SoCs are capable of YCbCr
output to the HDMI block.

Read the negotiated bus format from the bridge state and propagate it to
the CRCT state in form of output mode and bus format. Treat the format
MEDIA_BUS_FMT_FIXED as RGB888 and reject any unsupported formats.

This has no inpact until dw-hdmi bridge is fully converted to a HDMI
bridge and also adds support for the "color format" connector property.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Tested-by: Heiko Stuebner <heiko@sntech.de> #rk3328
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20260518193748.2482823-11-jonas@kwiboo.se

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