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/include/osmocom/gsm/bts_features.h b/include/osmocom/gsm/bts_features.h
index 6856aac..d0dbe48 100644
--- a/include/osmocom/gsm/bts_features.h
+++ b/include/osmocom/gsm/bts_features.h
@@ -27,6 +27,7 @@
 	BTS_FEAT_PAGING_COORDINATION,	/* BTS hands CS paging to PCU/PACCH */
 	BTS_FEAT_IPV6_NSVC,
 	BTS_FEAT_ACCH_REP,
+	BTS_FEAT_CCN, /* Is CCN supported by the cell? TS 44.060 sec 8.8.2 */
 	_NUM_BTS_FEAT
 };