Fix fd leak while bypassing transcoding in media APIs

To call the media service while bypassing transcoding there are 4 file
descriptors involved:

A: The original file descriptor the app owns and is responsible for
closing
B: Dupe of A, to pass into the MediaStore API as an input to receive a
non-transoding fd
C: The output from the MediaStore API
D: Final fd owned by the media service, after C gets duped over binder
as part of setDataSource

We were leaking (B) and (C). Now we close them appropriately.

See I0124ec8fbd0471237e99bab321f903544f8fe1f8 for another 2 fd leak
fix in MediaProvider

Test: atest TranscodeTest
Test: Manual with 'adb shell lsof | grep <filename>'
Bug: 194828489
Bug: 179804072
Change-Id: I978257bbc4a8f6813b6e6a5ce22124257204f432