Add license to ndk_headers.

Test: make ndk
Bug: None
Change-Id: Ic04e648cc74bbd79295e89c07d92b0fdb2fb7978
diff --git a/Android.bp b/Android.bp
index edd3d04..53f8bec 100644
--- a/Android.bp
+++ b/Android.bp
@@ -3,6 +3,7 @@
     from: "include/camera/ndk/",
     to: "camera",
     srcs: ["include/camera/ndk/**/*.h"],
+    license: "NOTICE",
 }
 
 ndk_headers {
@@ -10,6 +11,7 @@
     from: "include/ndk/",
     to: "media",
     srcs: ["include/ndk/**/*.h"],
+    license: "NOTICE",
 }
 
 subdirs = [