[roll] Roll fuchsia [fidlcat] Make register prop fallback defines work for host tests too

The properties ZX_PROP_REGISTER_FS and ZX_PROP_REGISTER_GS are not
available from the kernel definitions when building on mac-arm64, since
they're x64-specific.

We unify all the places we depend on stubbing this out for non-x64 host
tool or test usages into one header that gets transitively included in
all the relevant places.

Original-Bug: b/283475308
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/920941
Original-Revision: cd416d93131c91aebb878b5641d68f59e60cebbb
GitOrigin-RevId: 717912a421329549ebfe93087b3e76bb22b55fe4
Change-Id: Ibf86af4fd0e9c976c1a85865d64645a741ca0f49
diff --git a/stem b/stem
index dd295d3..eeeddc6 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="531318ec4e4e30a0babe065ae48eab0d93327f23"/>
+             revision="cd416d93131c91aebb878b5641d68f59e60cebbb"/>
   </projects>
   <hooks>
     <hook name="install-environment"