drm/xe/tuning: Add missing engine class rules for LRC tuning

drm/xe/tuning: Add missing engine class rules for LRC tuning

The LRC tuning settings we have today are modifying registers that are
part of the RCS engine's context; they're not part of the general CSFE
context that would apply to all engines.  Add ENGINE_CLASS(RENDER) to
the RTP rules to properly restrict these to the RCS.

Bspec: 46255, 46261
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20230929230332.3348841-2-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>