[vulkan] add flush + lock to encoder (host)

- support cross-encoder flushing
- make that thread safe

bug: 135464985
Change-Id: I164fd0d9cf615f58f52192a0a907f7008abc7241
2 files changed
tree: 0805bf8ba7287b4f10a31dff9281d1490d60ca4d
  1. registry/