Provide support for controlling reset pin. If this is not driven
correctly the device will be held in reset and will not respond.
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>