Change saveAttributes implementation

Context: http://shortn/_b43rjiwjmE
TLDR: saveAttributes renames and removes original file, which results
in MediaProvider removing it from its DB and thus unintentionally
removing other associated data.
This CL changes saveAttributes implementation to copy the original
file to a temp file and write over the original file instead to
prevent it from being removed in the MediaProvider DB.

See aosp/1428429 for reference.

Bug: 168706052
Test: atest CtsMediaTestCases:android.media.cts.ExifInterfaceTest
Change-Id: Ib01471e5fb8f1610a9a8eba741bea9a084021151