contrib/*sysmo.sh: Fix default poky SDK version to 2.3.4

Current latest poky SDK is 2.3.4, and that's the one we have installed
in all buildhosts.

Change-Id: I8c855456c7f94a3d6ee58ca550a056a0fea61a71
diff --git a/contrib/jenkins-build-osmo-bts-sysmo.sh b/contrib/jenkins-build-osmo-bts-sysmo.sh
index 4370ecd..82dae39 100755
--- a/contrib/jenkins-build-osmo-bts-sysmo.sh
+++ b/contrib/jenkins-build-osmo-bts-sysmo.sh
@@ -4,7 +4,7 @@
 _poky_version="$POKY_VERSION"
 _poky_path="$POKY_PATH"
 
-[ -z "$_poky_version" ] && _poky_version="2.3.2"
+[ -z "$_poky_version" ] && _poky_version="2.3.4"
 [ -z "$_poky_path" ] && _poky_path="/opt/poky/$_poky_version"
 
 . "$_poky_path/environment-setup-armv5te-poky-linux-gnueabi"