omap4: increase SRAM budget to fix build error

Signed-off-by: Aneesh V <aneesh@ti.com>
Cc: Dirk Behme <dirk.behme@googlemail.com>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Acked-by: Dirk <Behme&lt;dirk.behme@googlemail.com>