[roll] Roll fuchsia [kernel][vm] Re-introduce access scan on MRU aging

This reverts I030860f81eff6707afd1154ae5edeea214582bc5 and puts a
harvesting step back into the MRU aging path.

Since its removal the accessed harvesting has been made much more
efficient, and new data shows that the increase in accessed scan CPU
time is minimal, and the improvement to the pages chosen for
reclamation to be significant.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1272612
Original-Revision: f1e42334743b9227b4d29fb27778bcf84eeb7f11
GitOrigin-RevId: cc3931fb278c344a9663ac8c012f82ae24acf39b
Change-Id: Ib653f3f30e984cd540f1883bc2a6f292689e3dd1

stem

diff --git a/stem b/stem
index b6915da..2ea320e 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
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+             revision="f1e42334743b9227b4d29fb27778bcf84eeb7f11"
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