ARM: dts: mvebu: armada-370-xp: Add MBus mappings for all SPI devices

This patch adds the static MBus mappings for all supported SPI devices
(8 per controller) for the direct access SPI mode. They can be configured
and enabled by setting these MBus mapping in the 'ranges' property of the
per-board 'soc' node. If nothing is changed here, the default 'normal'
(indirect) SPI mode is used.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Mark Brown <broonie@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>