Update sdbus-cpp in buildroot

Change-Id: I8b6db1e60e158b4b20748eda1fdddee55042b236
diff --git a/submodules/buildroot b/submodules/buildroot
index afc84e6..eef374b 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit afc84e6a49b47e4ddb848aeaf1bd613d3cec0a40
+Subproject commit eef374bc84848cac16129c4c305dcf050203618e