GMII based PHY IDs for Linux v2.13.6.

Functions for RGMII GMII MII initialization, configuration, and monitoring.

Overwrite val to GMII if splitter core is enabled. The phymode here is the actual phy mode on phy hardware, but phy interface EMAC core is GMII. -Overwrite val to GMII if splitter core is enabled. The phymode here is the actual phy mode on phy hard