audio: Add IBluetoothLe

Similar to IBluetooth and IBluetoothA2dp interfaces,
IBluetoothLe controls the LE profile. This interface
replaces the following string parameter:

"LeAudioSuspended"

Bug: 270731693
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I9df28053cd270fc2d446ba9a8ada4dd6ab761c7b
Merged-In: I9df28053cd270fc2d446ba9a8ada4dd6ab761c7b