[AWARE] Add unit test - fix hashing bug

Adding unit tests to verify hashing code uncovered a bug (hashing
arrays) - fixed.

Bug: 130051430
Test: atest android.net.wifi
Test: atest com.android.server.wifi
Test: ACTS ThroughputTest:test_iperf_single_ndp_aware_only_ib
Change-Id: I4c654dd656b4bd1bce8077c73c66f458d103bc86