sound: usb: Add QMI bye callback

On unexpected SSRs, a del client notification may not be sent. In order
to receive client removal notifications in this situation, usb should
register for the bye callback. Perform client disconnect cleanup in
the bye callback.

Change-Id: Id99195994a828f80e8acff8c21d1cf69e9ad1e49
Signed-off-by: Chris Lew <clew@codeaurora.org>