For the design of LS1088A DDR4，Some questions need to be consulted:
1、 If DDR4 design is dual ranks，32bit，Is it necessary to divide MODT, MCS, MCKE, and MCK into two groups ?such as:
0) MODT(0), MCS(0), MCKE(0), MCK(0);
1) MODT(1), MCS(1), MCKE(1), MCK(1).
2、Whether LS1088 support mirring DDR4 or not?
