drivers/video/backlight/adp5520_bl.c: use devm_ functions

drivers/video/backlight/adp5520_bl.c: use devm_ functions

The various devm_ functions allocate memory that is released when a driver
detaches.  This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.

Signed-off-by: Julia Lawall <[email protected]>
Cc: Dimitris Papastamos <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Florian Tobias Schandinat <[email protected]>
Cc: Mark Brown <[email protected]>
Acked-by: Michael Hennerich <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>