board: bsh: imx6ulz_smm_m2: Add support for 256 MiB DRAM

Calibration values were calculated using the NXP tool
I.MX6ULL_DDR3_Script_Aid_V0.01.xlsx

Signed-off-by: Wolfgang Birkner <wolfgang.birkner@bshg.com>
Signed-off-by: Simon Holesch <simon.holesch@bshg.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
6 files changed