ram: rk3399: Add ddr version enc macro

Add dram config macro for handling ddr version number.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2 files changed