uboot-imx

sf: Do not force the DT memory map size to exactly match the device

As long as the memory mapped size specifeid in the DT is the same or
bigger than the device size, it will work. So do not force the sizes
to be identical.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>