leds-lm3530: replace i2c_client with led_classdev

To get members of lm3530_data, use 'struct led_classdev' rather than
'struct i2c_client'.

[akpm@linux-foundation.org: fix 80-column fixes more nicely]
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>