bts_feature: Introduce feature to speak to PCU

This feature provides the BSC with information on whether the BTS talks
the IPAC_PROTO_EXT_PCU osmocom extension over the underlying IPA
multiplex of the OML link.

Related: SYS#5303
Change-Id: Id62421f7f5540875ac877a187757f2cf0556bd02
diff --git a/src/gsm/bts_features.c b/src/gsm/bts_features.c
index fb3193f..6e63d5c 100644
--- a/src/gsm/bts_features.c
+++ b/src/gsm/bts_features.c
@@ -44,6 +44,7 @@
 	{ BTS_FEAT_ACCH_REP,		"FACCH/SACCH Repetition" },
 	{ BTS_FEAT_CCN,			"Cell Change Notification (CCN)" },
 	{ BTS_FEAT_VAMOS,		"VAMOS (Voice services over Adaptive Multi-user channels on One Slot)" },
+	{ BTS_FEAT_ABIS_OSMO_PCU,	"OsmoPCU over OML link IPA multiplex" },
 	{ 0, NULL }
 };
 
@@ -75,5 +76,6 @@
 	{ BTS_FEAT_ACCH_REP, "ACCH_REP" },
 	{ BTS_FEAT_CCN, "CCN" },
 	{ BTS_FEAT_VAMOS, "VAMOS" },
+	{ BTS_FEAT_ABIS_OSMO_PCU, "ABIS_OSMO_PCU" },
 	{}
 };