[roll] Roll fuchsia [sysmem] fuzzer needs to call sysmem_.Bind()

Put back the call to sysmem_.Bind() which is needed. The pdev_
field used to be banjo but putting back the fidl replacement.

Also call DdkUnbind and DdkRelease in tests to avoid needing
test-specific handling in sysmem ~Device.

Original-Bug: 110796
BUG: b/332631101
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1069418
Original-Revision: 510f6fc916383150eb948ce4d3ef44fb56d4848d
GitOrigin-RevId: c844f22ea9ddb84718f669f57f14361a37c567b9
Change-Id: I8b695766a55454df5957c4fd5ca78fc3337ff805
diff --git a/stem b/stem
index 00d5880..12f0a9b 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="cc0166066f5dca5745871d9e0492d2ee7f53bd47"/>
+             revision="510f6fc916383150eb948ce4d3ef44fb56d4848d"/>
   </projects>
   <hooks>
     <hook name="install-environment"