dt-bindings: power: reboot: Add Apple Mac SMC Reboot Controller

On Apple Silicon machines a clean shutdown or reboot requires
talking to SMC and writing to NVMEM cells. Add a binding for
this MFD sub-device.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Signed-off-by: Sven Peter <sven@kernel.org>
Link: https://lore.kernel.org/r/20250610-smc-6-15-v7-2-556cafd771d3@kernel.org


Signed-off-by: Lee Jones <lee@kernel.org>