Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/616fb21109ca
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #21010 from tauzen/Bug1017111

Bug 1017111 - [NFC] Techlist should be included with the NFC Activity, r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/0112187b0f11
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1017111 - [NFC] Techlist should be included with the NFC Activity

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https://hg.mozilla.org/integration/gaia-central/rev/dcc80f9afb6a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #19804 from yurenju/remove-clock-makefile

Bug 1017490 - rewrite clock build script in javascript r=@ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/01e0268c428a
Author: Yuren Ju <yurenju@gmail.com>
Desc: add make_gaia_shared.js back.

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https://hg.mozilla.org/integration/gaia-central/rev/902a0d674e98
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1017490 part 2 - rewrite clock build script in javascript

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "92928ba989e222a9b3a6aecac717c66cd1505be6", 
+    "revision": "616fb21109ca9af6e0371a6d109dc4e3032ae4be", 
     "repo_path": "/integration/gaia-central"
 }