Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7e3765585e50
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14301 from crh0716/921390

Bug 921390 - Display operator name for each SIM on the lockscreen of DSDS devices r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/7f4863dad55e
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 921390 - Display operator name for each SIM on the lockscreen of DSDS devices

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "dbb6fec241042c19b645ce922d402f793d88c682", 
+    "revision": "7e3765585e50b0c1c3d051ae94dadd276169fa32", 
     "repo_path": "/integration/gaia-central"
 }