Make it possible to pass multiple BLE services to settings

In BTIF layer, instead of passing just one service when it is discovered,
wait until service discovery is finished, and then go through whole list.

This enables us to pass multiple services from one device. This will be
useful for the LE Audio profile.

Bug: 176477621
Tag: #feature
Test: manually tested with LE and dual mode devices
Change-Id: I58ec5ff1740a6197b1a26ec74d21bd70b2f244d4