[magma] Use magma_connection_create_semaphore2 and import_semaphore2

Bug:108279
Run-All-Tests: True

Change-Id: I635a18cbd7ad83a7bff7388719135bae846dda0a
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/813711
Reviewed-by: John Bauman <jbauman@google.com>
3 files changed