Import final sdk version 31 from build 7637608

Note that this is a re-finalization of API 31, following a rename of
android.media.MediaTranscodeManager -> MediaTranscodingManager.  This
rename was done to avoid conflict with an existing copy in the R
framework.jar.

BUG: 195608856
Test: TH
Change-Id: I7bc6bd1ff79dac02b6c50b9d00ad6836456d7fd4
(cherry picked from commit 97da5ef13e11af9351b80500ae185ad85818805e)
14 files changed