There are two problems that made the driver choose the wrong baudrate
calculation algorithm:

a) The compatible used on 370/XP isn't marvell,armada-370-xp-spi but
   marvell,armada-370-spi or marvell,armada-xp-spi respectively.
b) The probe function uses
   	match = of_match_node(mvebu_spi_dt_ids, dev->device_node);
   to determine the right algorithm. As the devices are also compatible
   to marvell,orion-spi and this comes first in mvebu_spi_dt_ids[]
   it's always the older Orion algorithm that is used.

This patch fixes both problems.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>