Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2d15d799c130
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #25977 from cctuan/1092425

Bug 1092425 - System apps should follow text selection pattern.

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https://hg.mozilla.org/integration/gaia-central/rev/9ec3428da35d
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1092425 - System apps should follow text selection pattern

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https://hg.mozilla.org/integration/gaia-central/rev/f69cc36d7a8f
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #25913 from dwi2/bug1095219

Bug 1095219 - Fix failing card_manager_test.js and re-enable it in tv build only r=rickychien, johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/dba85e590a4d
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1095219 - fix require path and disable tv_apps/smart-home tests in CI

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5202f9aaf84476a92f000f7cbbd9a3483e6fc730", 
+    "revision": "2d15d799c130dbc1f50e8f60744d5f0322854168", 
     "repo_path": "/integration/gaia-central"
 }