Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/5c2da926d186
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #10630 from leob2g/bug_887133_icons_orientation_alignment

bug 887133 making flash and toggle camera icons to align with phone's orientation. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/f8a702c248f8
Author: jyothiprasadg <jyothi.prasad@lge.com>
Desc: bug 887133 making flash and toggle camera icons to align with phone's orientation

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https://hg.mozilla.org/integration/gaia-central/rev/4edaa4718091
Author: Francisco Borja Salguero Castellano <fbsc@tid.es>
Desc: Merge pull request #10641 from steveck-chung/MMS-Delivery-Report

Bug 883095 - [SMS] Delivery Report does not work

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https://hg.mozilla.org/integration/gaia-central/rev/9d19ac8e7447
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 883095 - [SMS] Delivery Report does not work

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "d573cf3fff64a00d7b20b9138c309e6d60ce15ad", 
+    "revision": "5c2da926d186adf29c960c18bf752bf7ac3642fd", 
     "repo_path": "/integration/gaia-central"
 }