OWNERS: drop people no longer working on CrOS

BUG=None
TEST=None

Change-Id: Ib5e4ebc0832ac8e6abac7c4ab1707ed38ce13fe2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/inputcontrol/+/5518311
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>