dt-bindings: net: cdns,macb: Deprecate magic-packet property

WOL modes such as magic-packet should be an OS policy.
By default, advertise supported modes and use ethtool to activate
the required mode.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Vineeth Karumanchi <vineeth.karumanchi@amd.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>