Add functions to integrate the full spec of LDAC SNK

Add functions to integrate the full spec of LDAC SNK

The LDAC SNK product is required implemented a buffer control mechanism called LDAC Buffer Control Operation.
This CL adds functions that needed to integrate LDAC Buffer Control Operation.
Note: LDAC Buffer Control Operation is provided separately. Please contact Sony to obtain.

Test: manual test, establish A2dp Connection with LDAC and play music, additionally swap to alternate codecs
Change-Id: I7dc4a0a5aa35dab71325d884e2836acbb7176acc
Signed-off-by: Chisato Kenmochi <Chisato.Kenmochi@sony.com>