Fix some nits with displaying Ethernet media status exposed by the recent
extended Ethernet media states:

• Don't apply IFM_SUBTYPE to the raw subtype in the description table. IFM_SUBTYPE() requires a fully populated word and was truncating values in the table when comparing resulting in false matches (notably "10GBase-KX4" for the no media case).
• Explicitly check for IFM_ETHER.
• Use SIOCGIFXMEDIA when present to obtain extended media states.
• Explicitly handle "no carrier".

PR: 202247
Reviewed by: bapt