drm/xe/tests/mocs: Hold XE_FORCEWAKE_ALL for LNCF regs

LNCF registers report wrong values when XE_FORCEWAKE_GT
only is held. Holding XE_FORCEWAKE_ALL ensures correct
operations on LNCF regs.

V2(Himal):
 - Use xe_force_wake_ref_has_domain

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1999


Fixes: a6a4ea6d ("drm/xe: Add mocs kunit")
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250428082357.1730068-1-tejas.upadhyay@intel.com


Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>