net: phy: micrel: use genphy_read_status for KSZ9131

KSZ9131 will not work with some switches due to workaround for KSZ9031
introduced in commit d2fd719b
("net/phy: micrel: Add workaround for bad autoneg").
Use genphy_read_status instead of dedicated ksz9031_read_status.

Fixes: bff5b4b3

 ("net: phy: micrel: add Microchip KSZ9131 initial driver")
Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>