arm: socfpga: Add USB and UDC support for Cyclone V DK

arm: socfpga: Add USB and UDC support for Cyclone V DK

Add support for USB host mode and USB device mode for the
Cyclone V development kit and enable support for UMS (to
export SD card as USB mass storage). The UMS is activated
via 'ums 0 mmc 0' command, the system must be connected to
a host PC via HPS USB port and SD card must be installed
for this to work.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@opensource.altera.com>
Acked-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Acked-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Vince Bridgers <vbridger@opensource.altera.com>