leds: bcm6328, bcm6358: use struct led_init_data when registering
By using struct led_init_data when registering we do not need to parse
`label` DT property. Moreover `label` is deprecated and if it is not
present but `color` and `function` are, LED core will compose a name
from these properties instead.
Signed-off-by: Marek Behún <marek.behun@nic.cz> Cc: Álvaro Fernández Rojas <noltari@gmail.com> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Jaedon Shin <jaedon.shin@gmail.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>