frameworks/av: port fixes in LPA and Tunnel mode playback Draft -2

-LPAPlayer: Update condition to ignore seek CRs-Fixed: 453067
-libstagefright: TunnelPlayer: update condition to send SEEK_COMPLETE
  CRs-Fixed: 441411
-libstagefright: Fix ANR with rigorous rewind of 3gp LPA clips
  CRs-Fixed: 491077 490992
-frameworks/av: Add  metadata mode changes to LPAPlayer
  CRs-Fixed: 458904 491077 490992

Change-Id: Ia89d7d6ac63b1267422a9138df9f98ef59b0ccb7