IOMX: restrict conversion of ANWB to gralloc source in emptyBuffer

This is only allowed in-process (if backup and codec buffers are
connected.)

FPIIM-1278
FPIIM-1276

Bug: 29422020
Bug: 31412859
Change-Id: If48e3e0b6f1af99a459fdc3f6f03744bbf0dc375
(cherry picked from commit 087ff38490016f4a0b6a1e717ae8af781d9b750c)
1 file changed