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

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https://hg.mozilla.org/integration/gaia-central/rev/470fba5af189
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #14567 from jmcanterafonseca/fix_export_sim_948862_master

Bug 948862 - [Contacts] The first time exporting a contact to SIM create...

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https://hg.mozilla.org/integration/gaia-central/rev/8cd90fb0054b
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 948862 - [Contacts] The first time exporting a contact to SIM creates a duplicate of the contact in the contact list

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "ac1bd42712a6c330ee768f3322afdd1d6c68b846", 
+    "revision": "470fba5af189d7df0f7301f028f64aaf58afaff5", 
     "repo_path": "/integration/gaia-central"
 }