net: phy: et011c: Remove incorrect PHY_POLL flags

PHY_POLL is defined as -1 which means that we would be setting all flags of the
PHY driver, this is also not a valid flag to tell PHYLIB about, just remove it.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>