Add license to ndk_headers.

Test: make ndk
Bug: None
Change-Id: Iaba7368b89ec446b5c65c7c127a98914bd949496
diff --git a/liblog/Android.bp b/liblog/Android.bp
index bbaced5..16aa4fa 100644
--- a/liblog/Android.bp
+++ b/liblog/Android.bp
@@ -104,6 +104,7 @@
     from: "legacy-ndk-includes",
     to: "android",
     srcs: ["legacy-ndk-includes/log.h"],
+    license: "NOTICE",
 }
 
 ndk_library {