Remove fuchsia.net.SocketProvider

fuchsia.net.SocketProvider has been replaced with
fuchsia.posix.socket.Provider.

Change-Id: If76c9a97177ae67413a38f19a34212e9aadd0271
diff --git a/meta/iperf3.cmx b/meta/iperf3.cmx
index 6eb8bbd..a534e9a 100644
--- a/meta/iperf3.cmx
+++ b/meta/iperf3.cmx
@@ -7,7 +7,6 @@
             "isolated-temp"
         ],
         "services": [
-            "fuchsia.net.SocketProvider",
             "fuchsia.posix.socket.Provider"
         ]
     }