drm/i915/rkl: Re-use TGL GuC/HuC firmware

RKL uses the same GuC and HuC as TGL and should load the same firmwares.

Bspec: 50668
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200504225227.464666-4-matthew.d.roper@intel.com