igc: Remove media type checking on the PHY initialization

i225 devices only have copper phy media type. There is no point in
checking phy media type during the phy initialization. This patch cleans
up a pointless check.

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>