drm/xe/configfs: Fix 'parameter name omitted' errors

drm/xe/configfs: Fix 'parameter name omitted' errors

On some configs and old compilers we can get following build errors:

  ../drivers/gpu/drm/xe/xe_configfs.h: In function 'xe_configfs_get_ctx_restore_mid_bb':
  ../drivers/gpu/drm/xe/xe_configfs.h:40:76: error: parameter name omitted
   static inline u32 xe_configfs_get_ctx_restore_mid_bb(struct pci_dev *pdev, enum xe_engine_class,
                                                                            ^~~~~~~~~~~~~~~~~~~~
  ../drivers/gpu/drm/xe/xe_configfs.h: In function 'xe_configfs_get_ctx_restore_post_bb':
  ../drivers/gpu/drm/xe/xe_configfs.h:42:77: error: parameter name omitted
   static inline u32 xe_configfs_get_ctx_restore_post_bb(struct pci_dev *pdev, enum xe_engine_class,
                                                                             ^~~~~~~~~~~~~~~~~~~~
when trying to define our configfs stub functions. Fix that.

Fixes: 7a4756b2fd04 ("drm/xe/lrc: Allow to add user commands mid context switch")
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Shuicheng Lin <shuicheng.lin@intel.com>
Link: https://patch.msgid.link/20260203193745.576-1-michal.wajdeczko@intel.com
(cherry picked from commit f59cde8a2452b392115d2af8f1143a94725f4827)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>