osmocom: Use CONFFILES for cfg files

Change-Id: I4a4c7d4a5e3e58c413c82b75f442ae9321d64998
diff --git a/recipes-osmocom/osmo-mgw/osmo-mgw.inc b/recipes-osmocom/osmo-mgw/osmo-mgw.inc
index 45ee338..1b3362f 100644
--- a/recipes-osmocom/osmo-mgw/osmo-mgw.inc
+++ b/recipes-osmocom/osmo-mgw/osmo-mgw.inc
@@ -5,7 +5,7 @@
 
 DEPENDS = "libosmocore libosmo-netif bcg729 libgsm"
 
-INC_PR="r0.${META_TELEPHONY_OSMO_INC}"
+INC_PR="r1.${META_TELEPHONY_OSMO_INC}"
 
 inherit autotools pkgconfig systemd
 
@@ -20,3 +20,4 @@
 }
 
 SYSTEMD_SERVICE_osmo-mgw = "osmo-bsc-mgcp.service"
+CONFFILES_osmo-mgw = "${sysconfdir}/osmocom/osmo-bsc-mgcp.cfg"