Inputflinger : Use BitArray class to replace raw bytes array.

For EventHub device, use std::bitset vector BitArray to store and input device event driver
property as bitmask, to replace the raw bytes array.

Bug: 160010896
Test: atest EventHubTest, atest inputflinger_tests

Change-Id: I6486535feb097f7dfb24a56f666b1d02ea736a58