bts_features: add feature for BCCH carrier power reduction mode

Change-Id: I69283b3f35988fc7a1a1dcf1a1ad3b67f08ec716
Related: SYS#4919
diff --git a/include/osmocom/gsm/bts_features.h b/include/osmocom/gsm/bts_features.h
index 8bd5ef5..5374619 100644
--- a/include/osmocom/gsm/bts_features.h
+++ b/include/osmocom/gsm/bts_features.h
@@ -30,6 +30,7 @@
 	BTS_FEAT_CCN, /* Is CCN supported by the cell? TS 44.060 sec 8.8.2 */
 	BTS_FEAT_VAMOS, /* Is the BTS VAMOS capable? */
 	BTS_FEAT_ABIS_OSMO_PCU, /* BTS supports forwarding data to PCUIF over IPA OML multiplex */
+	BTS_FEAT_BCCH_POWER_RED,
 	_NUM_BTS_FEAT
 };