Android 5.1.1_r28

Change-Id: Ic3850639b8285b0f9bc5e23de917cbfd12c908d8

default.xml

@@ -15,7 +15,7 @@
            review="gerrit.omnirom.org"
            fetch="https://github.com/omnirom" />
 
-  <default revision="refs/tags/android-5.1.1_r12"
+  <default revision="refs/tags/android-5.1.1_r28"
            remote="aosp"
            sync-c="true"
            sync-j="4" />