cros_ec: spi: disable annoying key echo on console

on Peach-pi console every key press is echoed with message
'cros_ec_command: Returned status 1'

this is not proper fix, just hack to disable this message

Signed-off-by: Milan P. Stanić <mps@arvanta.net>
Reviewed-by: Simon Glass <sjg@chromium.org>