LE audio hardware offload session switch for encode direction

The patch including:
1. Introduce two properties to switch the hardware/software path
2. Based on the property and the HAL version, supported hci command to decide the
path (not including audio policy, HAL, and controller capabilites, will
do it later)
3. In the initial version, the path is decided as Bluetooth turn on and
config data path via hci command
4. For encode only

Bug: 197296692
Bug: 150670922
Test: Verify LE audio hardware offload with HAL 2.2 for media
Test: Verify LE audio software path with HAL 2.1/2.2 with property
config

Change-Id: I7a03752bc262b82439dd295876cf256177fedeee