ms: update submodule to currently known working version

Change-Id: I690f508d1f0cee0b623196dd4574c3ee456f07fa
diff --git a/osmocom-bb b/osmocom-bb
index 040bf41..c209242 160000
--- a/osmocom-bb
+++ b/osmocom-bb
@@ -1 +1 @@
-Subproject commit 040bf4102892ddba1a4574d85b31653131c5ede4
+Subproject commit c209242d196a9c30401c383104f5063d4dbde4cd