Since kernel 5.9, there is a new kernel option CONFIG_LEDS_TURRIS_OMNIA [1], which adds LED support for CZ.NIC Turris Omnia, but to have them exposed to userspace, there is a patch series currently on review [2].
The sysfs path was changed, so let's only support it.
- [1] https://cateee.net/lkddb/web-lkddb/LEDS_TURRIS_OMNIA.html
- [2] https://lore.kernel.org/linux-leds/20220704105955.15474-1-kabel@kernel.org/T/#mb89a4ca5a836f17bdcc53d65549e0b1779bb6a18
Fixes #830