Edgeble NCM6A-IO board has M.2 M-Key via PCI3x4.

Add support for it.
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20231125190522.87607-8-jagan@edgeble.aiSigned-off-by: Heiko Stuebner <heiko@sntech.de>