MediaBufferGroup: release buffers in add_buffer when growth limit reached

Test: Webm high bitrate content
Bug: 32156769
Change-Id: Id77d023299a851ac6bf8f90c4eea90fe125ea3f5
(cherry picked from commit 7f7dea6a92e12d395d470d51c8157d6ef230200b)
1 file changed