All the TMDS DVO chips have a sensible looking .detect().
Let's poll them.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200121171100.4370-8-ville.syrjala@linux.intel.com


Acked-by: Jani Nikula <jani.nikula@intel.com>