Add hypan@ to //infra/OWNERS.

The time has come.

Bug: None
Change-Id: Ied2bb8875c2451f72704a121c5cfcea601b85d3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399433Reviewed-by: Haiyang Pan <hypan@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805355}

infra/OWNERS

@@ -5,6 +5,7 @@
 bpastene@chromium.org
 estaab@chromium.org
 gbeaty@chromium.org
+hypan@google.com
 martiniss@chromium.org
 
 # Other folks who understand the infrastructure well.