sdk: Add missing libosmotrau-dev after split from libosmo-abis

After splitting libosmotrau from libosmo-abis in
127bed3ceb41015d8fd36779689ab6d799f773f6, related libosmotrau dev were
moved to its own package, which was not added to the include list for
the SDK. As a result, somo-bts cannot be built anymore as it fails to
find libosmotrau pkgconfig file, headers and shared object file.

Change-Id: I42f3fa2ad82bfadb48f22167e42a08974fef16ab
diff --git a/recipes-osmocom/packagegroup/packagegroup-core-standalone-osmo-sdk-target.bb b/recipes-osmocom/packagegroup/packagegroup-core-standalone-osmo-sdk-target.bb
index dd5072b..2aed3f1 100644
--- a/recipes-osmocom/packagegroup/packagegroup-core-standalone-osmo-sdk-target.bb
+++ b/recipes-osmocom/packagegroup/packagegroup-core-standalone-osmo-sdk-target.bb
@@ -5,7 +5,7 @@
 DESCRIPTION = "Software Development Kit for Osmocom devices"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
-PR = "r5"
+PR = "r6"
 
 ALLOW_EMPTY_${PN} = "1"
 
diff --git a/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc b/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc
index 0a3f1d4..5055689 100644
--- a/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc
+++ b/recipes-osmocom/packagegroup/packagegroup-sdk-osmo.inc
@@ -5,6 +5,7 @@
     libosmocore-dev \
     libosmo-sccp-staticdev \
     libosmo-abis-dev \
+    libosmotrau-dev \
     libgtp-dev \
     libdbi-dev \
     libsmpp34-dev \