Bluetooth: Introduce open/close interfaces for ANT

Introduce Open/Close interfaces for ANT so that ANT module
can retrieve the ANT channel for send/receive of ANT data

Also Enables Bluetooth clean turn on flag so that there will be
no unnececessary turn off happens before Bluetooth turn-on
is dispatched

Change-Id: I8583ca529d7aae0b6a18813e200a8a2643b31fb1