[iperf] Add dependency to fuchsia.device.NameProvider.

When running iperf3 with -V or -J option, it tries to get system info by
calling uname() which requires access to fuchsia.device.NameProvider.

This fix is a precursor to write SL4F tests for fxb/45804 that parse the
json output from iperf3 which includes system-info.

Change-Id: Ia562ed8cfdcfe3a4840ba65ab6277a3e92febf5c
diff --git a/meta/iperf3.cmx b/meta/iperf3.cmx
index a534e9a..115b6e9 100644
--- a/meta/iperf3.cmx
+++ b/meta/iperf3.cmx
@@ -7,6 +7,7 @@
         "services": [
+            "fuchsia.device.NameProvider",