virgl: add support for untyped resources
An untyped resource is a virgl_resource in virglrenderer that is fd-based and has no type information. For an untyped resource to be usable by vrend_context, Mesa needs specify the type info (width, height, format, etc.) such that virglrenderer knows how to create the vrend_resource from the fd.
This MR adds VIRGL_CCMD_PIPE_RESOURCE_SET_TYPE and calls it from virgl_resource_from_handle.