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

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https://hg.mozilla.org/integration/gaia-central/rev/6e20235b0613
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23010 from KevinGrandon/bug_1048458_rocketbar_dialer_weirdness

Bug 1048458 - [B2G][2.1][Dialer] Calling a second number while another call is in progress cover's touchpad in Dialer app

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https://hg.mozilla.org/integration/gaia-central/rev/25735263fe21
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1048458 - [B2G][2.1][Dialer] Calling a second number while another call is in progress cover's touchpad in Dialer app r=kgrandon

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "32843e3e1c26a194dfacac2a900083e8cea556b9", 
+    "revision": "6e20235b0613fbdd6d14d248f4f5aabfb7f244a9", 
     "repo_path": "/integration/gaia-central"
 }