aaudio: MMAP input not implement pause flush

They should return AAUDIO_ERROR_UNIMPLEMENTED
just like the legacy streams.

Bug: 63351465
Test: CTS test_aaudio.cpp testPauseAndFlushNotSupported
Change-Id: I42c8d45517bf0d808e648287579b9fb0c0cb3ae0
7 files changed