uboot-imx

ddr: socfpga: Fix IO in Arria10 DDR driver

The Altera Arria10 DDR driver was using constants in a few places
instead of reading registers associated with those constants, fix
this.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>