SystemServer: improve coverage detection

Overload annotation is creating as many overload as possible and they
appear uncovered in test, while they are.

Deleting the overload and manually implement the only 2 necessary help
for detection

Bug: 311772251
Flag: Exempt refactor
Test: atest ServiceBluetoothRoboTests
Change-Id: I62c533f349c24b2943e4fd184b9e8add20c86b06