This reverts commit 51397d7d95.
There are some unresolved random crashes on WRT1900AC v1 that still need
to be sorted out
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Disable marvell,nand-keep-config property on WRT1900AC to allow the
flash driver to properly probe the chip
Signed-off-by: Felix Fietkau <nbd@nbd.name>