Add whalechang@ to OWNERS_chromeos

Bug: 315075685
Test: m com.android.btservices
Flag: EXEMPT, add whalechang@ in ONWER file will only affect permission of codebase for whalechang@

Change-Id: I4f198101cb7694a26c86aef25848f2e9d7194886

OWNERS_chromeos

@@ -6,6 +6,7 @@ sonnysasaka@google.com
 enshuo@google.com
 hychao@google.com
 jrwu@google.com
+whalechang@google.com
 
 # General review
 michaelfsun@google.com