dt: bindings: Add multicolor class dt bindings documention

Add DT bindings for the LEDs multicolor class framework.
Add multicolor ID to the color ID list for device tree bindings.

CC: Rob Herring <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Acked-by: Jacek Anaszewski <[email protected]>
Signed-off-by: Dan Murphy <[email protected]>
Reviewed-by: Marek BehĂșn <[email protected]>
Signed-off-by: Pavel Machek <[email protected]>
2 files changed