RT77788. k70-som: Set DDR setting R2RSAME to 3 to avoid memory corruptions
* When Ethernet and/or LCD are extensively utilized, the DDR controller send command to the memory chip very often, so that sometimes these commands go back-to-back to one another. In this situation the value of the R2RSAME parameter is taken into account by the DDR controller. * The necessary value for CR37[R2RSAME] was found experimentally. The K70 Reference Manual is very unclear on the exact meanings of delays set by the fields of the DDR_CR37 register (including R2RSAME).