inputflinger: Restricted invalid InputDeviceClass enum values

Updated FuzzEventHub::getDeviceClasses() to avoid
returning invalid InputDeviceClass enum values.

Added IfThisThenThat Lint to remind the InputClassDevices
enum to sync

Test: ./inputflinger_keyboard_input_fuzzer
Bug: 351972616
Flag: EXEMPT bugfix in fuzzer

Change-Id: I23fa0e501714c8a6029d132934293c1884950a7e
2 files changed