OWNERS: fix email addresses

owners and reviewers records are required to be email addresses that
match the ones used in Gerrit.  Update this file to match.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I88b834d3ea3e845ea4ec0d12dd6beb21b0a5deb0
diff --git a/OWNERS b/OWNERS
index 45316db..af82312 100644
--- a/OWNERS
+++ b/OWNERS
@@ -33,10 +33,10 @@
 
 owners:
 - chuong.tran@amperecomputing.com
-- thubanguyen
+- thu@os.amperecomputing.com
 
 reviewers:
-- dcao-ampere
+- dung@os.amperecomputing.com
 
 matchers: