manifest: android-7.1.2_r2 -> android-7.1.2_r8

Change-Id: I27b0bf81001cba56bd799d642370281bf81f5642
diff --git a/default.xml b/default.xml
index 25c177f..191b70e 100644
--- a/default.xml
+++ b/default.xml
@@ -11,7 +11,7 @@
   <remote  name="aosp"
            fetch="https://android.googlesource.com"
            review="android-review.googlesource.com"
-           revision="refs/tags/android-7.1.2_r2" />
+           revision="refs/tags/android-7.1.2_r8" />
 
   <default revision="refs/heads/cm-14.1"
            remote="github"