gralloc: Default flexible YUV format to NV21_ZSL

There could be buffers allocated in flexible YUV format without any
camera usage flags. Default the format for such buffers to NV21_ZSL.

Bug: 24197991
Change-Id: I25814aed652bfcddb19b411499bc8d64e76e081b
1 file changed
tree: 0d0ceebbc1016fd1d56e520cbcf32c01e008582e
  1. msm8084/
  2. msm8226/
  3. msm8960/
  4. msm8974/
  5. msm8994/
  6. Android.mk