ARM: dts: pfla02: prepare storage devices to add paritions

Partitions in the NOR and EEPROM are application specific. Prepare the
SoM device tree so platform device tree's can add partitions.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>