libstagefright: Add the conditions to ignore seek and allow sink stop

 -If app issues the multiple seek request to EOF position, player EOS
  gets delayed and app does not move to the next clip.
 -Seek interrupt the sink stop issued at EOF, hence delay in EOS.
 -Do not skip the sink stop if renderer position is EOF and ignore
  seek if seek time is same as player position.

Change-Id: Ic313eabfb738201b6b516555051a7a65c2bf8de2
CRs-Fixed: 667151