ARM: OMAP: ID: Chip detection for OMAP4470

Add support for detection of the next chip in the OMAP4 family: OMAP4470 ES1.0

For more details on OMAP4470, visit:
http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?templateId=6123&navigationId=12869&contentId=123362



Signed-off-by: Leonid Iziumtsev <x0153368@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>