arm: mx6: cm_fx6: change issd gpio order

Change the order in which GPIOs are toggled in SATA init sequence to
accomodate both SanDisk and Phison SSDs.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>