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

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https://hg.mozilla.org/integration/gaia-central/rev/6e573e40f830
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Revert "Merge pull request #24506 from ian-liu/settings/bug1074075_refactor_bluetooth_description_in_settings_root_panel""

This reverts commit c435661fb4de45e6e1a2e41db2c29d9e407a79d1.

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https://hg.mozilla.org/integration/gaia-central/rev/f2dbb15e211f
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Merge pull request #24506 from ian-liu/settings/bug1074075_refactor_bluetooth_description_in_settings_root_panel"

This reverts commit 1ef381a0646c6e0bbe2ee8fb719bf057674b504b, reversing
changes made to 96c1272cd2623616b8fa77237cc48cb82951d953.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4b140afdff455b6bf0d9a3cf67867f3f1717a66a", 
+    "revision": "6e573e40f830ec815b804cf1d160fe7a60a598e5", 
     "repo_path": "/integration/gaia-central"
 }