drm/xe: add new type to RTP context

Prepare the RTP context to be used before GT init. Add the xe device as
a type, put WARN_ONs to protect existing RTP_MATCHes.

v5: split out into separate patch, change definition order
v6: catch missing cases for checking gt init

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://lore.kernel.org/r/20250709221605.172516-4-matthew.s.atwood@intel.com


Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>