aacenc: handle and warn overlapping timestamps

Bug: 143676467
Test: bug repro steps
Test: atest CtsMediaTestCases -- --module-arg CtsMediaTestCases:size:small
Merged-In: I09c679330e6c3fdf7329a1723b5e31cbd1c7e65b
Change-Id: I09c679330e6c3fdf7329a1723b5e31cbd1c7e65b
(cherry picked from commit 227480430bdfa82b62832336fdb3dee3140c8c87)
2 files changed