ARM: OMAP: VMALLOC Size

This patch increases the size of VMALLOC to accommodate the bigger DDR and
NOR flashes being used now. Since SRAM is allocated at the end of VMALLOC
area, moving the SRAM virtual address also.

Signed-off-by: Rohit Choraria <rohitkc@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>