[Bluetooth] Update OWNERS of //device/bluetooth/dbus

Bug: None
Change-Id: Idd225bb0aef666c2c1918229df84ac742ab033ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2196485Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Commit-Queue: Sonny Sasaka <sonnysasaka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768504}

device/bluetooth/dbus/OWNERS

 mcchou@chromium.org
+sonnysasaka@chromium.org
 
 # COMPONENT: OS>Systems>Bluetooth