They are no longer used after conversion to QOM.
Also removing the drv_opaque from a few of the pcm_ops methods.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>