Add hovering support to verifier

In order to allow fuzzing of dispatcher, we need to be able to avoid
incorrect hover sequences sent to the listener.

Add hovering support for verifier in this CL.

Bug: 211379801
Test: TEST=inputflinger_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST
Change-Id: If7ee8ecb62044768915acc4657029366e193c6db
5 files changed