Analogous to the of_property command, add an -f option to the of_node
command. This option defers the device tree modification until boot
time and thus applies the modification as a fixup on the linux device
tree.

Signed-off-by: Florian Bäuerle <florian.baeuerle@allegion.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>