SDRAM controller enable
CONFIG_SSCTRL
  Say Y here to enabled a 32-bit synchronous SRAM (SSRAM) controller.
  The controller is designed for piplined ZBT SSRAM.

CONFIG_SSCTRL_PROM16
  Say Y here to enabled a 16-bit PROM support. The PROM should be
  connected to D[31:16] of the data bus.

