Update OWNERS for composer/2.1/vts

Update the OWNERS file to match the respective files
from 2.2, 2.3 and 2.4.

Bug: 188686850
Test: n/a
Change-Id: I0ff9923695813da3dbec1aa94fe1a2bd988e521e
diff --git a/graphics/composer/2.1/vts/OWNERS b/graphics/composer/2.1/vts/OWNERS
index 0b42d2e..ea06752 100644
--- a/graphics/composer/2.1/vts/OWNERS
+++ b/graphics/composer/2.1/vts/OWNERS
@@ -1,6 +1,6 @@
 # Graphics team
+adyabr@google.com
 lpy@google.com
-vhau@google.com
 
 # VTS team
 yim@google.com