sandbox: config: Enable cros_ec emulation and related items

Enable the Chrome OS EC emulation for sandbox along with LCD, sound
expanded GPIOs and a few other options to make this work correctly.

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>