Bluetooth: Introduced new interface for handling VS implementations

Introduced new interface for handling vendor specific implementations

Created an API in the vendor interface that initiates SSR cleanup
that will be called in the case of enable and disable timeout.
SSR cleanup is called when the Bluetooth shuts down abruptly.
It sends vendor power OFF to the controller so that the next
startup occurs properly.

Created an API in the vendor interface that will be called while
transitioning from TURNING_OFF to BLE_ON, which cleanup the BREDR
profiles (from the btif layer). A callback is initiated from btif
layer which is redirected by the interface to the original implementation
of stopping the BREDR profiles. Also, since the cleanup for BREDR
profiles in the btif layer already happened during transition to
BLE_ON , the cleanup during BLE_TURNING_OFF to OFF is limited to
BLE profiles.

CRs-Fixed: 1027432

Change-Id: I7836a6323c10e7b6e41eedd33151d256d7531440