default: Update to Android-4.4.4_r1

Change-Id: I4c3b28e6a838f047ba6ec791329055898b81d36f

default.xml

@@ -15,7 +15,7 @@
            review="gerrit.omnirom.org"
            fetch="https://github.com/omnirom" />
 
-  <default revision="refs/tags/android-4.4.3_r1.1"
+  <default revision="refs/tags/android-4.4.4_r1"
            remote="aosp"
            sync-c="true"
            sync-j="4" />