[scpi] Add fuchisa.kernel.Stats to the manifest

scpi currently tries to connect to the service in the code but I
accidently left it out of the manifest in my migration cl.

Bug: 36146
Change-Id: I5fa61b378461e97f43d3c288364ab9ba17ad4215
diff --git a/garnet/bin/scpi/meta/scpi.cmx b/garnet/bin/scpi/meta/scpi.cmx
index 328cbb0..87324bb 100644
--- a/garnet/bin/scpi/meta/scpi.cmx
+++ b/garnet/bin/scpi/meta/scpi.cmx
@@ -3,7 +3,7 @@
         "binary": "bin/app"
     },
     "sandbox": {
-        "services": [ "fuchsia.sys.Launcher" ],
+        "services": [ "fuchsia.kernel.Stats", "fuchsia.sys.Launcher" ],
         "dev": [ "class/thermal" ]
     }
 }