Update gingerbread

Change-Id: Ibb4e9d00b6d559a33a686a740019933c59bfbed0
Removed strong 'white noise' on startup. Synchronized FM audio with actual station using preset buttons. Optimized radio on/off sequences.

Change-Id: Ibe534d1a6ffb933ac92bbcb59df8b33ba1dcb86a
Changed the App name used in log messages to 'FMRadioService' from 'FMService' to simplify the logcat debugging. Add the fmGetAudioFocus() method (see also IFMRadioService.aidl) in order to make simpler the program flow.

Change-Id: Ic31b261890a4d46b9da5654f8bceda85d02e19a7