[vulkan][magma] Use magma_connection_import_semaphore2

Run-All-Tests: true

Change-Id: I88cbfb7fd34e5f804bd03174e86380ed4de73fd2
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/916952
Reviewed-by: John Bauman <jbauman@google.com>
Commit-Queue: Craig Stout <cstout@google.com>