ARM: OMAP4+: Fix MA detection during SDRAM_AUTO_DETECTION

During SDRAM_AUTO_DETECTION MA is not configured.
For Soc's > OMAP4460 MA is present. So populating
MA for the same.

Tested on OMAP4430 PANDA, OMAP4460 PANDA.

Reported-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>