drivers: ethernet: enc424j600: Reduce interrupt command lengths
drivers: ethernet: enc424j600: Reduce interrupt command lengths

The enc424j600 chipet has 1-byte commands to enable or disable
interrupts which an be used rather than the currently used 4-byte
commands to speed the process up by a factor of 4x

Signed-off-by: Jamie McCrae <7c977670495befe33b67661379bf81cc6b3660ab@lairdconnect.com>

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