[roll] Roll fuchsia [power] Add integration test back to riscv64 builders

The power manager integration test was very flaky on riscv64 builders
because currently all riscv64 builder tests are configured to run on
emulators. fxr/1122216 configures the integration test to only run on
real hardwares. We no longer need the restriction on riscv64 builders.
This CL undos the change made in fxr/1118624.

Multiply: power-manager-integration-test: 100
Test: CQ
Original-Fixed: b/367454381
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1122416
Original-Revision: afc72d371dff37f67b4ebb09a1ff5df5edc57ec3
GitOrigin-RevId: a762e39206b4eadfc23d5c9235a12192c5df111e
Change-Id: I98995976a90b5096d2a30024fb1a7fbd1c9e1548
diff --git a/stem b/stem
index 0ba2aae..7b5d51b 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="efdb86a2bb284eb1d47db3fba563ad16ed1bad93"/>
+             revision="afc72d371dff37f67b4ebb09a1ff5df5edc57ec3"/>
   </projects>
   <hooks>
     <hook name="install-environment"