[roll] Roll fuchsia [wlan][policy] Allows PhyManager to set region.

This change adds a new method to the PhyManager to allow
callers to set the regulatory region on all known PHYs and
store the region for future use.  For now, this
functionality is test-only.

Original-Bug: 68373
Test: fx test wlancfg-tests
Multiply: wlancfg-tests
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/497604
Original-Revision: b820097db2f5629cedfb41c6c0828a7c120f5a00
GitOrigin-RevId: d0acd059b4a6fa814278acdbd1dde8d792a2e3a7
Change-Id: I865bc78451a21d92ea97231889507cc6d679d1a4
diff --git a/stem b/stem
index 7bf7822..44926cc 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="42bcb570a7f91b862c1b24b1b23b498f096ae494"/>
+             revision="b820097db2f5629cedfb41c6c0828a7c120f5a00"/>
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