binarystore: Update MAINTAINERS and OWNERS. Remove maxims and kunyi

Both maxims and kunyi are not active on the project anymore.

Add benjaminfair and wltu as the owner.

Change-Id: I3b704f9aeb95c94f051ef1910a27f0e39f326688
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/OWNERS b/OWNERS
index 86658d4..d9bfcc5 100644
--- a/OWNERS
+++ b/OWNERS
@@ -32,10 +32,10 @@
 # data within them will be kept sorted.
 
 owners:
-- kunyi731@gmail.com
+- benjaminfair@google.com
+- wltu@google.com
 
 reviewers:
-- benjaminfair@google.com
 - venture@google.com
 
 matches:
@@ -44,9 +44,9 @@
 - name: Benjamin Fair
   email: benjaminfair@google.com
   discord: benjaminfair
-- name: Kun Yi
-  email: kunyi731@gmail.com
-  discord: NA
 - name: Patrick Venture
   email: venture@google.com
   discord: Venture
+- name: Willy Tu
+  email: wltu@google.com
+  discord: wltu