drm/xe/reg_sr: Use a single parameter for xe_reg_sr_apply_whitelist()

All other parameters can be extracted from a single struct xe_hw_engine
reference. This removes redundancy and simplifies the code.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20230609143815.302540-2-gustavo.sousa@intel.com


Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>