Update notes for submitted changes

* libHardware changes to support Avrcp1.5
* libhardware: Enable MMAP interface in USB Audio HAL
* Bluetooth: SAP: Header files changes to support SAP on Bluedroid
* libhardware: Add MSM string parameters.
* libhardware: Add APIs to support DirectTrack
* Bluetooth: Added function prototype for codec.
* Bluetooth: Added new prototype of HFP feature bitmask.
* audio: Add QCOM feature support for frame size
* libhardware: Add keys to support FM