drm/i915: Allow static DRRS on all eDP ports

Only seamless DRRS has specific hardware requirements so
we can allow static DRRS on any eDP port.

And we can replace these port checks and whatnot with
a simple check to make sure the transcoder(s) we're
about to use are capable of seamless DRRS.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220331112822.11462-11-ville.syrjala@linux.intel.com


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