gsm: add missing features to osmo_bts_features_names[]

Change-Id: I0ff47a79d611cd1c2d23ac5b4d53dca27e402821
Fixes: 812dfbf3a756088ef8ae083044c690783ef84067
diff --git a/src/gsm/bts_features.c b/src/gsm/bts_features.c
index 1cc3c26..1e041c7 100644
--- a/src/gsm/bts_features.c
+++ b/src/gsm/bts_features.c
@@ -82,5 +82,7 @@
 	{ BTS_FEAT_DYN_TS_SDCCH8, "DYN_TS_SDCCH8" },
 	{ BTS_FEAT_ACCH_TEMP_OVP, "ACCH_TEMP_OVP" },
 	{ BTS_FEAT_OSMUX, "OSMUX" },
+	{ BTS_FEAT_VBS, "VBS" },
+	{ BTS_FEAT_VGCS, "VGCS" },
 	{}
 };