smsc75xx: fix phy init reset loop

fix bug in phy_init loop that was ignoring BMCR reset bit, akin to smsc95xx's d9460920



Signed-off-by: Stephane Fillod <fillods@users.sf.net>
Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>