drm/xe/guc: Port Wa_14014475959 to xe_wa and fix it

drm/xe/guc: Port Wa_14014475959 to xe_wa and fix it

Port Wa_14014475959 to xe_wa fixing its condition. The workaround should
only be applied on the primary GT, not on media. So just checking by
MTL platform is not enough: checking GT is of the right type is also
needed.

Since the GRAPHICS_STEP() does checks the GT type, we could leave the
first check as a platform one: it'd would be easier to understand and
not go out of sync with the graphics_ip_map[] in
drivers/gpu/drm/xe/xe_pci.c. However it also means that new platforms
using the same IP wouldn't match. Prefer using the IP version.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230526164358.86393-22-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>