Add notice of requesting source code in appsearch

Flag: EXEMPT license change for b/418865751
Bug: 418865751
Test: presubmits
Test: lunch husky-trunk_staging-eng && m, an extra line is added at the top of NOTICE.html file in NOTICE.html.gz
Change-Id: If04c1108639465e7e78bd9665f39938642125bd5
1 file changed