This patch converts my orion5x ls-chl Linkstation device to device tree.

[gregory.clement@free-electrons.com: fix title, add back the commit log,
move the removal of the platform in an other patch]
Signed-off-by: NAshley Hughes <ashley.hughes@blueyonder.co.uk>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>