gsm: bts_features: Introduce BTS_FEAT_CCN

This feature is used by BSC to gain knowledge on whether a given BTS
supports GPRS Cell Change Notification (CCN) related procedures on PDCH,
and as a result enable or not by default the CCN_ACTIVE bit in SI13 to
announce the support it is allowed to use the feature.

Related: SYS#4909
Change-Id: I61991266b95d0c13d51b47906cc07846e9cf1390
diff --git a/src/gsm/bts_features.c b/src/gsm/bts_features.c
index d8c27d8..1e15616 100644
--- a/src/gsm/bts_features.c
+++ b/src/gsm/bts_features.c
@@ -42,6 +42,7 @@
 	{ BTS_FEAT_PAGING_COORDINATION,	"BSS Paging Coordination" },
 	{ BTS_FEAT_IPV6_NSVC,		"NSVC IPv6" },
 	{ BTS_FEAT_ACCH_REP,		"FACCH/SACCH Repetition" },
+	{ BTS_FEAT_CCN,			"Cell Change Notification (CCN)" },
 	{ 0, NULL }
 };