we need to disable second SD chip select properly else the SDRAM size
detection will detect it but there is no memory connected so the boot
will fail
Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Florian Vallee <fvallee@eukrea.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>