Add led configuration for pcb8291 and pcb8309. Both pcbs have 4 leds which
are connected to the sgpio controller.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220902062447.443846-1-horatiu.vultur@microchip.com