Remove the constraints on custom event input codes
Manual test steps:
1. Start emulator
2. Run `make SampleCustomInputService`
3. Run `adb install $OUT/target/product/emulator_car_x86/system/app/SampleCustomInputService/SampleCustomInputService.apk`
4. Run `adb shell am start-foreground-service com.android.car.custominput.sample/.SampleCustomInputService`
Trigger Assistant by injecting key events:
5.1. To inject KEYCODE_VOICE_ASSIST (action down) key event, run:
`adb shell cmd car_service inject-custom-input -d 0 1009`
5.2. To inject KEYCODE_VOICE_ASSIST (action up) key event, run:
`adb shell cmd car_service inject-custom-input -d 0 1010`
Bug: 213896131
Test: atest CarServiceUnitTest
Test: atest SampleCustomInputServiceTest
Change-Id: I163ae85cd93f99956c1f7da82aa43949043b1c99
Merged-In: Ice1161ca50e3d39be72b6a7ae5d8a9a766eff8ed
(cherry picked from commit 1d6f47fdc93d862fd73a5e30db95260a8fff23f7)
Native (C++) code format is required to be compatible with .clang-format file. Run
git clang-format --style=file --extension='h,cpp,cc' HEAD~
Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.