Add SRAM support for 3430

Patch modified by Tony to leave out new functions,
they will be added later in a separate patch.

Signed-off-by: Karthik Dasu<karthik-dp@ti.com>
Acked-by: Richard Woodruff <r-woodruff2@ti.com>
Acked-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>