uboot-imx

Disable unused chip-select for DDR controller interleaving

When DDR controller interleaving is eabled and less than all bank (chip-select)
interleaving is seletected, the unused chip-select should be disabled.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>