drm/xe: Move guc msg buffer into xe_guc_ct
Fix: kernel/drivers/gpu/drm/xe/xe_guc_ct.c:953:1: error: the frame size of 1344 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
(with gcc 10.3 / Ubuntu 20.04.3 LTS)
Signed-off-by: Philippe Lecluse philippe.lecluse@intel.com