drm/i915: Include pixel format in plane tracepoints

Make debugging a bit easier by including the pixel format in
the plane tracepoints.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241218173650.19782-5-ville.syrjala@linux.intel.com


Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>