The Nokia N900's modem is connected via Synchronous Serial Interface (SSI),
which is a legacy version of MIPI's High-speed Synchronous Serial Interface
(HSI).

The handles the GPIOs for enabling and resetting the modem and instanciates
ssi-protocol for data exchange. It does not yet support exchanging voice data
with the modem.
Signed-off-by: NSebastian Reichel <sre@kernel.org>
Reviewed-by: NPavel Machek <pavel@ucw.cz>
Tested-By: NIvaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>