All flash controllers have a mandatory compatible property.
Add it to the generic binding that is included by all.
Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>
So far, DT did not support the flash driver name.
Any flash-controller should have the appropriate
flash driver that should be identified by its name.
This path adds generic support for extract the description
from the flash-controller node,
adds implementation of this property for all nrf5x targets.
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>