BtAdapterUtils: Increase ADAPTER_ENABLE_TIMEOUT_MS

This CL changes the time limit for waiting AdapterService
as a first step to prevent BluetoothLeAudioTest.setUp()
from failing.

The maximum observed time to start AdapterService was
9 seconds, so this CL makes the time limit as 18 seconds.

Bug: 215577157, Bug: 215680994, Bug: 219473233
Test: Ran below command five times:
      atest android.bluetooth.cts.BluetoothLeAudioTest\
        --rerun-until-failure 100 -- --abi x86_64
      (It normally failed in 2 times)
Change-Id: I5a96a818c28a700763370cfd57cc47f622e13fc0
1 file changed