Switch to ConcurrentHashMap for CompatConfig
Use ConcurrentHashMap instead of a SparseLongArray guarded by a reentrant readwrite lock to make CompatConfig.isChangeEnabled as fast as possible. Test: atest CompatConfigTest Bug: 197712476 Bug: 191398285 Change-Id: I498c439baf3e060ec7feb68ed581ca680e2ebcad
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