drm/i915: Warn if someone tries to use intel_set_transcoder_timings*() on DSI outputs

intel_set_transcoder_timings*() aren't currently suitable for DSI.
Warn if someone accidentally calls them in such cases.

Cc: Paz Zcharya <pazz@chromium.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250116201637.22486-5-ville.syrjala@linux.intel.com


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