drm/xe/rtp: Move match function from wa to rtp

Match functions are generally useful for other parts of the code (e.g.
xe_tuning.c). Move and rename the single one available to create a place
where similar match functions can be added.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>