arm: socfpga: cyclone5_socdk: Enable qspiload console command

Enabling qspiload command which will load the kernel
image and dtb from UBIFS within MTD partition labeled
UBI.

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: Pavel Machek <pavel@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>