Bluetooth 5 AdvertisingSet implementation (2/4)

This patch wires up fist methods of AdvertisingSet, making it possible
to start advertising and stop advertising. It also replaces legacy
implemementation with calls to new implementation.

Bug: 30622771
Test: sl4a ConcurrentBleAdvertisingTest
Change-Id: I35e7db5df1945d101402299f78dd541e346d548c