libbt: BT USB support

1. Skip baud rate configuration
2. Read BD Address from device
3. No specific configuration is required for SCO
4. SCO does not use I2S interface

Issue: AXIA-1459
Issue: AXIA-1460
Change-Id: I22a8cdde2b5b2ad11b21e7d1d2578b4323e812b2
Signed-off-by: Ravindranath Doddi <ravindranathx.doddi@wipro.com>