media: i2c: lm3560: Convert to use OF bindings

media: i2c: lm3560: Convert to use OF bindings

Since there are no users of this driver via platform data, remove the
platform data support and switch to using Device Tree bindings.

Converting to Device Tree assumes dynamic and independent registration of
LEDs. To monitor the configured LEDs, a bitmap has been added. This makes
LED cleanup more robust and less context dependent.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>