leds: convert bd2802 driver to dev_pm_ops

There is a move to deprecate bus-specific PM operations and move to using
dev_pm_ops instead in order to reduce the amount of boilerplate code in
buses and facilitiate updates to the PM core.  Do this move for the bs2802
driver.

[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Kim Kyuwon <q1.kim@samsung.com>
Cc: Kim Kyuwon <chammoru@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>