ALSA: ca0106 - Add missing registrations of vmaster controls

commit 601e1cc5 upstream.

Although the vmaster controls are created, they aren't registered thus
they don't appear in the real world.  Added the missing snd_ctl_add()
calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>