Revert "CCodec: don't drop metadata for output with flag FLAG_DROP_FRAME." This reverts commit b8fe01e5992d688987637fd7cbbbbe617293a9da. Bug: 193482724 Bug: 193867146 Test: cts/media/device-small Change-Id: I00375414c2e0491f4af4681858eae17e0dc43be6