libyuv/README.libaom: add Chromium required fields

+ make License more specific to match the allow list

Bug: 421989373
Fixed: 421989373
Change-Id: I3aa70c63bebb41b8f3a566238a89d51a72787656

third_party/libyuv/README.libaom

diff --git a/third_party/libyuv/README.libaom b/third_party/libyuv/README.libaom
index fcdf921..dfb81d8 100644
--- a/third_party/libyuv/README.libaom
+++ b/third_party/libyuv/README.libaom
@@ -1,8 +1,10 @@
 Name: libyuv
 URL: https://chromium.googlesource.com/libyuv/libyuv/
 Version: dfaf7534e0e536f7e5ef8ddd7326797bd09b8622
-License: BSD
+License: BSD-3-Clause
 License File: LICENSE
+Shipped in Chromium: no
+Security Critical: yes
 
 Description:
 libyuv is an open source project that includes YUV conversion and scaling