Parent and device were pointing to the same device structure.

Parent is unused, removed.
Signed-off-by: NGwendal Grignou <gwendal@chromium.org>
Tested-by: NStephen Barber <smbarber@chromium.org>
Tested-by: NHeiko Stuebner <heiko@sntech.de>
Tested-by: NGwendal Grignou <gwendal@chromium.org>
Reviewed-by: NPuthikorn Voravootivat <puthik@chromium.org>
Signed-off-by: NJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: NLee Jones <lee.jones@linaro.org>