No longer call service to know its state

Since the AdapterService always call the BMS with a callback to update
its state, the BMS does not need to make an extra binder call to get the
current state value

Bug: 262605980
Test: Manual
Test: adb shell cmd bluetooth_manager disable && \
      adb shell cmd bluetooth_manager wait-for-state:STATE_OFF &&\
      adb shell cmd bluetooth_manager enable
Change-Id: I27bb747a73ab990e50d41d1bf6d939e1f5668d6d