omap: tsl2563 ALS support for Nokia N900

This commit will enable usage of tsl2563 ambient light sensor on Nokia N900.

Signed-off-by: Ameya Palande <ameya.palande@nokia.com>
Signed-off-by: Mathias Nyman <mathias.nyman@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>