bts_features: Add new feature to indicate support for temporary overpower

To indicate to the BSC that a BTS supports temporary overpower of
SACCH/FACCH channels a new feature BTS_FEAT_ACCH_TOP is added.

Change-Id: I62fbfc30acd5d67b20727b75a8f256e6b5d31e06
Related: SYS#5319
diff --git a/include/osmocom/gsm/bts_features.h b/include/osmocom/gsm/bts_features.h
index 42e1934..54f17ed 100644
--- a/include/osmocom/gsm/bts_features.h
+++ b/include/osmocom/gsm/bts_features.h
@@ -32,6 +32,7 @@
 	BTS_FEAT_ABIS_OSMO_PCU, /* BTS supports forwarding data to PCUIF over IPA OML multiplex */
 	BTS_FEAT_BCCH_POWER_RED,
 	BTS_FEAT_DYN_TS_SDCCH8, /* Osmo Dynamic TS supports configured as SDCCH8 */
+	BTS_FEAT_ACCH_TEMP_OVP, /* FACCH/SACCH Temporary overpower */
 	_NUM_BTS_FEAT
 };