Initial version of Support for Nokia *Site BTS

This includes the MetroSite, but also other Nokia BTS models.
diff --git a/openbsc/src/libcommon/gsm_data.c b/openbsc/src/libcommon/gsm_data.c
index 6b15bd0..c70ffae 100644
--- a/openbsc/src/libcommon/gsm_data.c
+++ b/openbsc/src/libcommon/gsm_data.c
@@ -193,6 +193,7 @@
 	{ GSM_BTS_TYPE_NANOBTS,	"nanobts" },
 	{ GSM_BTS_TYPE_RBS2000,	"rbs2000" },
 	{ GSM_BTS_TYPE_HSL_FEMTO, "hsl_femto" },
+	{ GSM_BTS_TYPE_NOKIA_SITE, "nokia_site" },
 	{ 0,			NULL }
 };