axnet_cs: fix phy_id detection for bogus Asix chip.

axnet_cs:

(1) Some Asix phy return bogus value except 0 or 0xffff.
    Skip this phy_id.

(2) Some Asix chip need to set "select Internal PHY" bit
    at AX88190_init.

Signed-off-by: Ken Kawasaki <ken_kawasaki@spring.nifty.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>