Hap: cleanup test

Split native interface between call to native and call from native in
order to mock one when using the other in test
Remove direct call on mock
Remove some bloated code in test

Test: atest BluetoothInstrumentationTests:.HapClient*Test
Bug: 311772251
Flag: TEST_ONLY
Change-Id: I3fbbbd6f6180bcc2e73a05a4a33ee85264cf1672