gsm_data: Update trx_is_usable for ericsson BTS

There is no bb_transc oject.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: I34bb808cd21575ff25d36e6df028b140935a008f
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index ecc1f0a..545019b 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -1719,6 +1719,18 @@
 	return 0;
 }
 
+static inline int is_ericsson_bts(struct gsm_bts *bts)
+{
+	switch (bts->type) {
+	case GSM_BTS_TYPE_RBS2000:
+		return 1;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
 static inline int is_e1_bts(struct gsm_bts *bts)
 {
 	switch (bts->type) {