clang: Clang warns we have this value twice...

The type is TLV_TYPE_FIXED, 2 according to the
ipaccess wireshark dissector.
diff --git a/openbsc/src/bts_ipaccess_nanobts.c b/openbsc/src/bts_ipaccess_nanobts.c
index b58d83b..6ba469c 100644
--- a/openbsc/src/bts_ipaccess_nanobts.c
+++ b/openbsc/src/bts_ipaccess_nanobts.c
@@ -34,7 +34,6 @@
 			[NM_ATT_IPACC_DST_IP] =		{ TLV_TYPE_FIXED, 4 },
 			[NM_ATT_IPACC_DST_IP_PORT] =	{ TLV_TYPE_FIXED, 2 },
 			[NM_ATT_IPACC_STREAM_ID] =	{ TLV_TYPE_TV, },
-			[NM_ATT_IPACC_FREQ_CTRL] =	{ TLV_TYPE_TV, },
 			[NM_ATT_IPACC_SEC_OML_CFG] =	{ TLV_TYPE_FIXED, 6 },
 			[NM_ATT_IPACC_IP_IF_CFG] =	{ TLV_TYPE_FIXED, 8 },
 			[NM_ATT_IPACC_IP_GW_CFG] =	{ TLV_TYPE_FIXED, 12 },