omap4: Enable RTC and regulator support

This patch enables RTC and regulator support on omap4430 sdp
platform. Also sync up the defconfig with latest kernel

Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>