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

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https://hg.mozilla.org/integration/gaia-central/rev/9a608c49a2ef
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #23887 from ian-liu/settings/bug1057188_l10n_string_revised_for_mount_unmount_sd_card

Bug 1057188 - L10n follow-up for mount/unmount SD card, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/87409e71da46
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1057188 - L10n follow-up for mount/unmount SD card

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "3377f81fce5690ce8a423266c13705a204a11f3b", 
+    "revision": "9a608c49a2ef84d54a8d695e505fa98b28571342", 
     "repo_path": "/integration/gaia-central"
 }