Merge tag 'android-security-11.0.0_r49' into int/11/fp3

Android security 11.0.0 release 49

* tag 'android-security-11.0.0_r49':
  Decoder: Update check for increment u2_cur_slice_num
  encoder: fix invalid free of raw buffers
  avcenc: Add bitstream overflow check during emulation prevention
  decoder: Update check for first mb in slice

Change-Id: If6fd32f83ae7e1d21db8d4837c9a2509087b53ec