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

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https://hg.mozilla.org/integration/gaia-central/rev/690d2ea2241b
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #13652 from rexboy7/fix-bug933576

Bug 933576 - [Dialer] (regression) Call screen should be shown when ente...

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https://hg.mozilla.org/integration/gaia-central/rev/a8eb679f6144
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 933576 - [Dialer] (regression) Call screen should be shown when entering dialer app

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f5f41d05a7277ddb9466aa4235204b817a5e89a6", 
+    "revision": "690d2ea2241bce1dd65dfe7ff76ddc040f3110c7", 
     "repo_path": "/integration/gaia-central"
 }