properly update osmocom-bb submodule, for real this time..

Change-Id: Icb3ba575cf5235db7e6c03df3d7d45133d535c50
diff --git a/.gitmodules b/.gitmodules
index a964ce2..99afef8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,3 @@
 [submodule "osmocom-bb"]
 	path = osmocom-bb
 	url = https://gitea.osmocom.org/phone-side/osmocom-bb.git
-	branch = a6d2e1a12b0204f1b1690c42371980dd6895f076
diff --git a/osmocom-bb b/osmocom-bb
index a4aac5c..040bf41 160000
--- a/osmocom-bb
+++ b/osmocom-bb
@@ -1 +1 @@
-Subproject commit a4aac5c3554559c2c994609f90b92a9daf6e8a89
+Subproject commit 040bf4102892ddba1a4574d85b31653131c5ede4