OWNERS: Replace furquan with shchen and twawrzynczak

BUG=None
TEST=None

Change-Id: I8f83146e8eead5c537fa0b6403946802dac45787
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/edk2/+/3238904
Tested-by: Furquan Shaikh <furquan@chromium.org>
Auto-Submit: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Dossym Nurmukhanov <dossym@chromium.org>
Commit-Queue: Dossym Nurmukhanov <dossym@chromium.org>