Copy the NOTICE file when updating headers.

Test: ./update_headers.sh
Bug: None
Change-Id: Ibde1e6d7ef1750d8369b65b3125b55023efb5b2a
diff --git a/tools/update_headers.sh b/tools/update_headers.sh
index 345b657..e5b87f1 100755
--- a/tools/update_headers.sh
+++ b/tools/update_headers.sh
@@ -41,5 +41,7 @@
 versioner -p versioner/platforms versioner/current versioner/dependencies \
   -o $HEADERS_INSTALL
 
-git -C $PREBUILTS_DIR add $HEADERS_INSTALL
+cp ../libc/NOTICE $PREBUILTS_DIR
+
+git -C $PREBUILTS_DIR add $HEADERS_INSTALL $PREBUILTS_DIR/NOTICE
 git -C $PREBUILTS_DIR commit -m "Update bionic headers to $VERSION."