[roll] Roll fuchsia [kernel] Remove old CPUID topology code

This code is no longer in use (and there are no projected usages for
which the current pace of the CpuidIo migration would present a
problem).

Original-Bug: 61093
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/474478
Original-Revision: f6ed109c08fd26921522bef9c1592be3d8929440
GitOrigin-RevId: 05162660da706eb97d683ae64cd92545fa804351
Change-Id: I5e4c7260b86a7003894ffeb4d0617f58192e78fe
diff --git a/stem b/stem
index b87283a..4c30a74 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="56439afdd24b25c59261acae8acecfa9d3fdfd05"/>
+             revision="f6ed109c08fd26921522bef9c1592be3d8929440"/>
   </projects>
   <hooks>
     <hook name="install-environment"