net: phy: improve phy_init_hw

Currently the soft reset (if defined) is done only if the driver also
implements the config_init callback. I think this dependency is a
mistake, so let's remove it.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>