dts: nrf5x: Setup partitions for NFFS

This patch adds partition for NFFS for nRF51, nRF52 and nRF52840.
The partition is placed at the end of flash. This is only added if NFFS
is enabled (since it's required) - in other case free space can be used
for other purposes.

Signed-off-by: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
3 files changed