Rename SMSC phy functions to be more generic

Several models of SMSC PHY have the same interrupt status and mask
registers as the LAN83C185, so these functions can service multiple
different PHY drivers.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>