Revert "Remove hychao@chromium.org from OWNERS files"

This reverts commit 492996ab.

Reason for revert: hychao@chromium.org is now Chromium committer.

Original change's description:
> Remove hychao@chromium.org from OWNERS files
> 
> They are not yet a Chromium committer so they can't Code-Review+1
> reviews. Until then they shouldn't be in an OWNERS file.
> 
> Change-Id: I3689ec2d4b64eecfb4f761a333ad565363fefed5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1928565
> Auto-Submit: Reilly Grant <reillyg@chromium.org>
> Commit-Queue: Jenny Zhang <jennyz@chromium.org>
> Reviewed-by: Jenny Zhang <jennyz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#717725}

TBR=jennyz@chromium.org,reillyg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I7f11c2b0cfe93170ac1e1522723d5a1a5349aa91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2345925Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Hsinyu Chao <hychao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796673}

chromeos/audio/OWNERS

 jennyz@chromium.org
+hychao@chromium.org
 # COMPONENT: OS>Kernel>Audio

chromeos/dbus/audio/OWNERS

 jennyz@chromium.org
+hychao@chromium.org