Appops refcount fixup

Fix two issues in Iea630bb2bf1b54697ab6a95ee9f65db5cc4d134a

1. Fix boolean return values in the startRecording method, which
   implicitly converted incorrectly.
2. Correctly handle virtual sources by not deriving their silence state
   from the existing checkPerm method, which checks OP_RECORD/RECORD
   perm. These sources should instead check only their associated op
   state.

For the second, update the appop callback listening/handling as well, by
only following/evaluating OP_RECORD for relevant sources.

Test: CtsMediaAudioPermissionTestCases
Bug: 293603271
Bug: 374800336
Bug: 374869085
Flag: EXEMPT security
Change-Id: I8a3498a08a31543219279cb063c043fd0c767cd7