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

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https://hg.mozilla.org/integration/gaia-central/rev/c54aa442e0e0
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22867 from yurenju/pull/22765

Bug 1002545 - Switching to b2g desktop builds r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/bdaa4efc1f56
Author: Martin Thomson <martin.thomson@gmail.com>
Desc: Bug 1002545 - Switching to b2g desktop builds

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4a3edbca9b7993419ee930789f2e2027b29394bd", 
+    "revision": "c54aa442e0e0faf285bcb57d98180ba1514efd24", 
     "repo_path": "/integration/gaia-central"
 }