drm/xe: Enable the compat ioctl functionality

This is required at the minimum for the DRM UAPI to function from
32-bit userspace with a 64-bit kernel.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>