Upgrade AndroidFrameworkBinderIdentity to fatal.

We've fixed all outstanding examples of malformed code, so we're
ready to upgrade this Error Prone detector to break the build to
ensure that all future code follows best-practices.

Bug: 155703208
Test: make
Change-Id: I617b8e7a8f96a4299ed0144bd915b87920f1af87
diff --git a/Android.bp b/Android.bp
index 06f3666..ae717f1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -601,6 +601,7 @@
     ],
     errorprone: {
         javacflags: [
+            "-Xep:AndroidFrameworkBinderIdentity:ERROR",
             "-Xep:AndroidFrameworkCompatChange:ERROR",
             "-Xep:AndroidFrameworkUid:ERROR",
         ],