Implements the Allocator 4.0 and Mapper 4.0 interfaces.
Some notable features of the 4.0 interface:
- buffer metadata getter/setters
- buffer flushing
- buffer debugging (buffer listing and buffer id)
BUG=b:161909468
TEST=build and launch Cuttlefish with Gralloc4
Change-Id: I63bdc76604207e1fcfe0135c9b64fa62bfba5b27
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2404601
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Jason Macnak <natsu@google.com>
Commit-Queue: Jason Macnak <natsu@google.com>
