gralloc: Default flexible YUV format to NV21

There could be buffers allocated in flexible YUV format that do
not have any camera usage flags. Default such buffers to NV21.

Bug: 22065781
Change-Id: I26c3fbf8b3ff62a271d042f20f6d85d6d02904ae
1 file changed
tree: 8df4dcd79713e4724128040333a9a56efb89545e
  1. msm8084/
  2. msm8226/
  3. msm8960/
  4. msm8974/
  5. msm8994/
  6. Android.mk