Add backlight intensity control to the LOCOMO lcd/backlight driver using the
backlight class and add basic power management support.

This is a reimplementation and improvement of patches by John Lenz and Pavel
Machek
Signed-off-by: NRichard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAntonino Daplas <adaplas@pol.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>