drm/xe/mert: Improve handling of MERT CAT errors

drm/xe/mert: Improve handling of MERT CAT errors

All MERT catastrophic errors but VF's LMTT fault are serious, so
we shouldn't limit our handling only to print debug messages.

Change CATERR message to error level and then declare the device
as wedged to match expectation from the design document. For the
LMTT faults, add a note about adding tracking of this unexpected
VF activity.

While at it, rename register fields defnitions to match the BSpec.
Also drop trailing include guard name from the regs.h file.

BSpec: 74625
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lukasz Laguna <lukasz.laguna@intel.com>
Reviewed-by: Lukasz Laguna <lukasz.laguna@intel.com>
Link: https://patch.msgid.link/20260112183716.28700-1-michal.wajdeczko@intel.com