spl: nand: support redundant u-boot image

spl: nand: support redundant u-boot image

On modern NAND it's more than recommended to have a backup copy of the
u-boot binary to recover from corruption: bitflips are quite common on
MLC NANDs, and the read-disturbance will corrupt your u-boot partitition
more quickly than what you would see on an SLC NAND.

Add an extra Kconfig option to specify the offset of the redundant u-boot
image.

Signed-off-by: Boris Brezillon <[email protected]>
Acked-by: Hans de Goede <[email protected]>
[scottwood: added ifdef to fix build break]
Signed-off-by: Scott Wood <[email protected]>