bts_features.h: Introduce BTS_FEAT_PAGING_COORDINATION

This feature indicates if the given BTS supports paging coordination,
that is the transmission of CS paging (received on Abis) to be sent
via PACCH/PCU in PS domain fro MS with active TBF.

Change-Id: Ifb2e83eaf05dd36e5b203ed2de1a74864b039e38
Related: OS#2406
diff --git a/src/gsm/bts_features.c b/src/gsm/bts_features.c
index e4ff76c..5a4b7f6 100644
--- a/src/gsm/bts_features.c
+++ b/src/gsm/bts_features.c
@@ -39,6 +39,7 @@
 	{ BTS_FEAT_SPEECH_F_AMR,	"Fullrate speech AMR" },
 	{ BTS_FEAT_SPEECH_H_AMR,	"Halfrate speech AMR" },
 	{ BTS_FEAT_ETWS_PN,		"ETWS Primary Notification via PCH" },
+	{ BTS_FEAT_PAGING_COORDINATION,	"BSS Paging Coordination" },
 	{ 0, NULL }
 };