Update dex_preopt related OWNERS

Bug: none
Test: none
Change-Id: I1e6c69b6e3abb54fd37f5b59dad4ced5ce761289
diff --git a/java/OWNERS b/java/OWNERS
index 16ef4d8..5242712 100644
--- a/java/OWNERS
+++ b/java/OWNERS
@@ -1 +1 @@
-per-file dexpreopt*.go = ngeoffray@google.com,calin@google.com,mathieuc@google.com
+per-file dexpreopt*.go = ngeoffray@google.com,calin@google.com,skvadrik@google.com