net: phy: mscc: coma mode disabled for VSC8584

This patch releases coma mode for VSC8584 as done for VSC8514 in
commit ca0d7fd0 ("net: phy: mscc: coma mode disabled for VSC8514")

Fixes: a5afc167

 ("net: phy: mscc: add support for VSC8584 PHY.")
Signed-off-by: Bjarni Jonasson <bjarni.jonasson@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>