drm/gpuvm: Add DRM_GPUVA_OP_DRIVER

Add DRM_GPUVA_OP_DRIVER which allows driver to define their own gpuvm
ops. Useful for driver created ops which can be passed into the bind
software pipeline.

v3:
 - s/DRM_GPUVA_OP_USER/DRM_GPUVA_OP_DRIVER (Thomas)
 - Better commit message (Thomas)

Cc: Danilo Krummrich <dakr@redhat.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250306012657.3505757-14-matthew.brost@intel.com

Author: mbrost05

include/drm/drm_gpuvm.h

@@ -812,6 +812,11 @@ enum drm_gpuva_op_type {
 	 * @DRM_GPUVA_OP_PREFETCH: the prefetch op type
 	 */
 	DRM_GPUVA_OP_PREFETCH,
+
+	/**
+	 * @DRM_GPUVA_OP_DRIVER: the driver defined op type
+	 */
+	DRM_GPUVA_OP_DRIVER,
 };
 
 /**