Add test for getVideoFrames

The new test is for the api EventHubInterface::getVideoFrames.
We are creating a videoframe in FakeEventHub and then making sure that
the listener receives the frame after sync happens.

Test: atest libinput_tests inputflinger_tests
Bug: 123241238
Change-Id: I1485ff30c5fb78a7785b6cbea76e8841ada40271