update_engine: Add kimjae@ as an owner

Also xiaochu@ has left the team. This removes him so he doesn't get
assigned to bugs/CLs, etc.

BUG=chromium:995893
TEST=None

Change-Id: Iafcb319f6471b0c462fc25741656c34cd2e2808b
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/update_engine/+/1775819
Tested-by: Amin Hassani <ahassani@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Nicolas Norvez <norvez@chromium.org>
Commit-Queue: Nicolas Norvez <norvez@chromium.org>
diff --git a/OWNERS b/OWNERS
index 6709d7a..4e47605 100644
--- a/OWNERS
+++ b/OWNERS
@@ -7,7 +7,7 @@
 # Chromium OS maintainers:
 benchan@google.com
 ahassani@google.com
-xiaochu@google.com
+kimjae@google.com
 
 # Chromium OS only:
 # COMPONENT: Internals>Installer