sound: usb: Add default branches for BADD 3.0 devices

For a BADD 3.0 device, the Data Endpoint wMaxPacketSize
of an Alt Setting must be one of the values mentioned in
the specifications. Similarly, the unit IDs of the source
units of any entity is prescribed by the specs. Add
support for checking the error(default) branches in the
relevant switch cases and accordingly handle them.

Change-Id: Ib88eee21df012089d41c4e78a161ddc6767e1bd4
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>