AudioFlinger: Move small files to afutils

Test: ALLOW_LOCAL_TIDY_TRUE=1 mm -j .
Bug: 287549635
Merged-In: I148097b7ed8091d549d1cf541105c31bceb7450f
Change-Id: I148097b7ed8091d549d1cf541105c31bceb7450f
(cherry picked from commit dcd740533ffb6cdc7a9f6014e29ea0e12caebd68)
5 files changed