Edgeble NCM6A, NCM6B SoM has Green LED on the module.

Enable them with heartbeat function.
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20231125190522.87607-11-jagan@edgeble.aiSigned-off-by: Heiko Stuebner <heiko@sntech.de>