e1000: fix mispatch for media type detect.

Recent patch was mismerged in the miitool path. e1000_media_type_copper
was being compared with the phy type instead of the media type.


Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>