Handle music key event in CarInputService

- handle music key event by openning default music activity in Car Service;
- add HAL emulator to Input fragment in Kitchen sink;
- fixed instrument cluster fragment issue (it was sticky);
- fixed Audio Focus HAL emulation (had a wrong data type);

Bug: 26961808
Change-Id: Ic205bb44fd8b11d6ad29a2c4a3e917729ce6e862
6 files changed