ARM: OMAP3: Enable 4-bit support for HSMMC.

This patch provides the fix to enable 4-bit support for HSMMC.

Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com>
Signed-off-by: purushotam<purushotam@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>