drm/xe: Print proper revid value for unknown media revision

If the GMD_ID register reports a higher media revision ID than we're
expecting, print the media revid, not the graphics revid, in the
debug message.

Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://lore.kernel.org/r/20230614205202.3376752-4-matthew.d.roper@intel.com


Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>