mem: Add missig timing and current parameters to DRAM configs

mem: Add missig timing and current parameters to DRAM configs

This patch adds missing timing and current parameters to the existing
DRAM configs. These missing timing and current parameters are required
by DRAMPower for the DRAM power calculations. The missing values are
datasheet values of the specified DRAMs, and the appropriate
references are added for the variuos configs.