Change how Advertise Data is passed to BTIF (2/3)

The way that AD data is passed right now put some additional
limitations, i.e. only one manufacturer specific data can be set, or
only one service UUID. By moving AD generation to upper layers, aother
set of limitations is removed.

Test: Covered by BleAdvertiseApiTest sl4a test
Bug: 30622771
Change-Id: Iee48ea30ec4c055eaa1ad0b1678686d261106e76