Update recipes to refelct osmo-iuh and osmo-hnbgw repo split

Since version 1.2.0 in both repos, osmo-hnbgw binary is placed in its
own repository, and no longer available in osmo-iuh.git.

Change-Id: I3ced52c1a9fccca34fe7c4ec245363d041105c2b
diff --git a/recipes-osmocom/osmo-hnbgw/osmo-hnbgw_git.bb b/recipes-osmocom/osmo-hnbgw/osmo-hnbgw_git.bb
new file mode 100644
index 0000000..df8c946
--- /dev/null
+++ b/recipes-osmocom/osmo-hnbgw/osmo-hnbgw_git.bb
@@ -0,0 +1,7 @@
+require ${PN}.inc
+
+S = "${WORKDIR}/git"
+SRCREV = "1.2.0"
+SRC_URI = "git://git.osmocom.org/osmo-hnbgw.git;protocol=git;tag=${SRCREV};nobranch=1"
+PV = "1.2.0+gitr${SRCPV}"
+PR = "${INC_PR}.0"