ddr

The code should be setting registers to zero, not one register to value.
Swap the order of arguments to correct the behavior. The behavior is now
in-line with code generated by Quartus 15.1 .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Chin Liang See <clsee@altera.com>