[roll] Roll fuchsia [netstack3] Split SlaacAddrsMutAndConfig

Split SlaacAddrsMutAndConfig, used to group arguments provided to SLAAC
state machine logic, into a mutable reference to SLAAC addresses and a
struct of configuration and state. Also take the latter struct as an
argument to add_slaac_addr_sub to reduce the number of positional
arguments.

Original-Bug: 42148800
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1196708
Original-Revision: a0a890278e3a4e08a75034f7d20378e7c01811fb
GitOrigin-RevId: 26e6749c498783bb6490b4207ab498d0ec28b432
Change-Id: I518b41207a23f7e47e4d7712e44a617cbadd49d4
diff --git a/stem b/stem
index 6d37833..a44e14c 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="b57c538cc08efaeabd0998c8bdf4e1fe7d2c7678"/>
+             revision="a0a890278e3a4e08a75034f7d20378e7c01811fb"/>
   </projects>
   <hooks>
     <hook name="install-environment"