Use general layout and 0 access masks for external synchronization as
specified in the spec.

Also set pipeline stages for maximum synchronization just in case
because it doesn't seem like the pipeline stages are specified.

"Vulkan-incompatible APIs will require the image to be in the GENERAL
layout whenever they are accessing them."

"Whilst it is not invalid to provide destination or source access masks
for memory barriers used for release or acquire operations,
respectively, they have no practical effect. Access after a release
operation has undefined results, and so visibility for those accesses
has no practical effect. Similarly, write access before an acquire
operation will produce undefined results for future access, so
availability of those writes has no practical use. In an earlier version
of the specification, these were required to match on both sides - but
this was subsequently relaxed. These masks should be set to 0."