drivers/video/backlight/ep93xx_bl.c: remove incorrect __init annotation

When platform_driver_probe() is not used, bind/unbind via sysfs is
enabled.  Thus, __init/__exit annotations should be removed from
probe()/remove().

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>