default: Update to android 4.4 r1.2 tag

Change-Id: Ie9608e849e81460e517d22fc536ed5f226c743d2

default.xml

@@ -15,7 +15,7 @@
            review="gerrit.omnirom.org"
            fetch="https://github.com/omnirom" />
 
-  <default revision="refs/tags/android-4.4_r1.1"
+  <default revision="refs/tags/android-4.4_r1.2"
            remote="aosp"
            sync-j="4" />