Bluetooth 5 AdvertisingSet implementation (3/4)

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: I843d8fc12ba1928c87e256a0fb6d730c9fa200e6