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

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https://hg.mozilla.org/integration/gaia-central/rev/89f47a652dab
Author: gitmai <mri@tid.es>
Desc: Merge pull request #15672 from gitmai/bug-943343-CC-VIVO-not-always-update-calls-and-sms

Bug 943343 cc vivo not always update calls and sms
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/cea6eaee8465
Author: mai <mri@tid.es>
Desc: Bug 943343 - [Costcontrol] Not always is updated information about calls made and sms sent for the user

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "34769c5ab47b95fe97fa0fe65e7e3a34f47b3f90", 
+    "revision": "89f47a652dab8d7df823d23e255dc35fafaa468d", 
     "repo_path": "/integration/gaia-central"
 }