remove 'bind early' from osmo-bsc_mgcp example config

(discovered by osmotestconfig.py)
diff --git a/openbsc/doc/examples/osmo-bsc_mgcp/mgcp.cfg b/openbsc/doc/examples/osmo-bsc_mgcp/mgcp.cfg
index c46b46d..7409dd0 100644
--- a/openbsc/doc/examples/osmo-bsc_mgcp/mgcp.cfg
+++ b/openbsc/doc/examples/osmo-bsc_mgcp/mgcp.cfg
@@ -11,7 +11,6 @@
   bts ip 172.16.252.43
   bind ip 127.0.0.1
   bind port 2427
-  bind early 1
   rtp base 4000
   sdp audio payload number 98
   sdp audio payload name AMR/8000