net: phy: bcm7xxx: define soft_reset for 40nm EPHY

The internal 40nm EPHYs use a "Workaround for putting the PHY in
IDDQ mode." These PHYs require a soft reset to restore functionality
after they are powered back up.

This commit defines the soft_reset function to use genphy_soft_reset
during phy_init_hw to accommodate this.

Fixes: 6e2d85ec ("net: phy: Stop with excessive soft reset")
Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/bcm7xxx.c

@@ -572,6 +572,7 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
 	.name           = _name,					\
 	/* PHY_BASIC_FEATURES */					\
 	.flags          = PHY_IS_INTERNAL,				\
+	.soft_reset	= genphy_soft_reset,				\
 	.config_init    = bcm7xxx_config_init,				\
 	.suspend        = bcm7xxx_suspend,				\
 	.resume         = bcm7xxx_config_init,				\