drm/i915/mtl: MTL has one GSC CS on the media GT

Now that we have the GSC FW support code as a user to the GSC CS, we
can add the relevant flag to the engine mask. Note that the engine will
still be disabled until we define the GSC FW binary file.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221208200521.2928378-7-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/i915_pci.c

@@ -1125,7 +1125,7 @@ static const struct intel_gt_definition xelpmp_extra_gt[] = {
 		.type = GT_MEDIA,
 		.name = "Standalone Media GT",
 		.gsi_offset = MTL_MEDIA_GSI_BASE,
-		.engine_mask = BIT(VECS0) | BIT(VCS0) | BIT(VCS2),
+		.engine_mask = BIT(VECS0) | BIT(VCS0) | BIT(VCS2) | BIT(GSC0),
 	},
 	{}
 };