packagegroup-sdk-osmo: Add libsctp as dependency for the SDK

Make libsctp available to be used by libosmo-netif and othr Osmocom
software.

Fixes: SYS#2524
diff --git a/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc b/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc
index 7e3b709..0a3f1d4 100644
--- a/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc
+++ b/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc
@@ -1,4 +1,5 @@
 SDK-OSMO = " \
+    lksctp-tools-dev \
     libusb1-dev \
     libtalloc-dev \
     libosmocore-dev \