[PATCH] Add LCD backlight driver for OMAP

This adds a driver for the PWL module of OMAP CPUs in the Linux
backlight API. The driver allows changing the backlight instensity and
switching it off when system goes idle. The declaration of struct
omap_backlight_config is sent in a separate patch.

Signed-off-by: Andrzej Zaborowski <balrog@zabor.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>