drm/xe/ptl: Enable PXP for PTL

Now that the GSC FW is defined, we can enable PXP for PTL. The feature
will only be turned on if the binary is found on disk.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Julia Filipchuk <julia.filipchuk@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260108011340.2562349-8-daniele.ceraolospurio@intel.com

Author: dceraolo

drivers/gpu/drm/xe/xe_pci.c

@@ -392,6 +392,7 @@ static const struct xe_device_desc ptl_desc = {
 	.has_sriov = true,
 	.has_mem_copy_instr = true,
 	.has_pre_prod_wa = 1,
+	.has_pxp = true,
 	.max_gt_per_tile = 2,
 	.needs_scratch = true,
 	.needs_shared_vf_gt_wq = true,