Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/6ce2fe088a11
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Bug 903232 - Show only gsm options by default"

This reverts commit ad7c92b4d02477d9096fed03963f9a2d8717a5a4.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6d0fbcfca3a1f3655f18bff0f3df287f16ee5a61", 
+    "revision": "6ce2fe088a1113ac761dfa1f6a6a09fb7f38f787", 
     "repo_path": "/integration/gaia-central"
 }