Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/40e122f61752
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #11133 from msujaws/patch-2

Bug 894232 - [Dialer] Disable 'Put call on hold' feature for Leo due to ... r=rik
(cherry picked from commit d6abf011ba3314f77fc687e73b842a46be6f3716)

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https://hg.mozilla.org/integration/gaia-central/rev/4acec9c82586
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #11017 from wanderview/contacts-defer-ph

Bug 894611: Defer contact placeholder creation during load.  r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/d4ad6f9d631a
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 894611: Defer contact placeholder creation during load.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "4e9ffaa0d1927cd8c868df526c253f39ab4f982b", 
+    "revision": "40e122f61752670e9fe4a5f3f3849a36d9045ccc", 
     "repo_path": "/integration/gaia-central"
 }