Fix bug 5374629 Can't create AudioPlayer playing from MP2TS ABQ

Fix bug 5374629 Can't create AudioPlayer playing from MP2TS ABQ

An AudioPlayer playing audio coming from MP2TS data stored in an
 AndroidBufferQueue couldn't be created and realized anymore due
 to:
  - a regression that prevented an OutputMix to be used as the
    sink of an AudioPlayer that had an ABQ as a data source
  - a missing update when the Realize() method became fully
    locked on the object, android_audioPlayer_realize() was
    still trying to lock the already locked AudioPlayer.
Both issues are covered by a CTS test.

Also verify the SLSeekItf is not required when using an ABQ
 source.

Change-Id: Ibb1b753dcce59b7cf23ba118e287349e00e7fff4