Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6aa5deaaeff8
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Merge pull request #23079 from acperez/bug-918982

Bug 918982 - FILE_NOT_FOUND error fired in logcat looking for singleVariant configuration file

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https://hg.mozilla.org/integration/gaia-central/rev/89bc3c5a416a
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Bug 918982 - FILE_NOT_FOUND error fired in logcat looking for singleVariant configuration file

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https://hg.mozilla.org/integration/gaia-central/rev/9857f2f1fab6
Author: Greg Weng <snowmantw@gmail.com>
Desc: Revert "Merge pull request #22100 from snowmantw/issue1043103"

This reverts commit 7065ddbc9c1bb08ca273362774bb142e3152cf0e, reversing
changes made to 70f3935608c9e21461db8f60c50ae1be78a4460c.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8fed0f3eae7c197b0534f8dbdbe2ff47bf0986ab", 
+    "revision": "6aa5deaaeff8c7ced693c329df201f2b1fe31ab3", 
     "repo_path": "/integration/gaia-central"
 }