Manifest for Android 7.1.2 Release 15 (NKG47L)

Change-Id: I978e54c0eaf7b53e1956052884b4642446e85d9a

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-7.1.2_r14"
+  <default revision="refs/tags/android-7.1.2_r15"
            remote="aosp"
            sync-j="4" />