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

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https://hg.mozilla.org/integration/gaia-central/rev/cd198e4a5536
Author: Marina <marina.rodrigueziglesias@telefonica.com>
Desc: Merge pull request #26355 from gitmai/bug-1089968-reset-usage-data

Bug 1089968 - [User Story] Reset usage data
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/c4ca18751b56
Author: mai <mri@tid.es>
Desc: Bug 1089968 - [User Story] Reset usage data

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c659a8149e13901dbd7fb8fdf93bb00019aab5fe", 
+    "revision": "cd198e4a55361d72002c22acf726ea10dbdc7e9f", 
     "repo_path": "integration/gaia-central"
 }