drm/xe: Add debugfs support for page reclamation

drm/xe: Add debugfs support for page reclamation

Allow for runtime modification to page reclamation feature through
debugfs configuration. This parameter will only take effect if the
platform supports the page reclamation feature by default.

v2:
 - Minor comment tweaks. (Shuicheng)
 - Convert to kstrtobool_from_user. (Michal)
 - Only expose page reclaim file if page reclaim flag
   initially supported and with that, remove
   xe_match_desc usage. (Michal)

Signed-off-by: Brian Nguyen <brian3.nguyen@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251212213225.3564537-22-brian3.nguyen@intel.com