drm/connector: Let connectors have a say in their color format

Add a function to get the connector color format from a connector state,
and a new function pointer in drm_connector_funcs to allow connectors to
override what connector color format it returns.

This is useful for the bridge chain recursive bus format selection code,
which does not wish to implement connector implementation specific
checks like whether it involves HDMI.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Link: https://patch.msgid.link/20260609-color-format-v17-4-35739b5782cc@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>

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