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

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https://hg.mozilla.org/integration/gaia-central/rev/e96d5a01194d
Author: Chris Jones <cjones.bugs@gmail.com>
Desc: Merge pull request #24453 from cgjones/board-gaia-make-flags

Bug 1071939: Initialize GAIA_MAKE_FLAGS with new var BOARD_GAIA_MAKE_FLA...

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https://hg.mozilla.org/integration/gaia-central/rev/6d5ca3d2c882
Author: Chris Jones <cjones.bugs@gmail.com>
Desc: Bug 1071939: Initialize GAIA_MAKE_FLAGS with new var BOARD_GAIA_MAKE_FLAGS. r=ochameau

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c3c5fc8e34a4b78fd56fc01778a58f38f7d7c4f5", 
+    "revision": "e96d5a01194db06fa4fd625177856fa5a8c172f8", 
     "repo_path": "/integration/gaia-central"
 }