[roll] Roll fuchsia [kernel][machina][arm] Only flush cacheable memory when trapping cache instructions

When trapping a cache cache instruction by way/set in the guest, the
VM will walk the guest stage 2 translations and flush all of the pages.
Skip S2 pages that are not mapped as full normal memory.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1044891
Original-Revision: 52623be0df8cb0a2824ef9c21afab6b055b8fe46
GitOrigin-RevId: 180a8fee1cfbd534d57355c8c27d40206ad956ce
Change-Id: I11529c8fb834bbe436d0ea3edfba3d072fd88f8d
diff --git a/stem b/stem
index a233ae9..4fce621 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="e1d9a6c8764fbe1fcbd5cffdd33b85877dcb56b6"/>
+             revision="52623be0df8cb0a2824ef9c21afab6b055b8fe46"/>
   </projects>
   <hooks>
     <hook name="install-environment"