Added prefix 'func_' to xgmii functions.

...ries/base/common/src/vhdl/common_interface_layers_pkg.vhd

libraries/io/tr_10GbE/src/vhdl/tr_10GbE.vhd

libraries/io/tr_xaui/src/vhdl/tr_xaui.vhd

libraries/io/tr_xaui/tb/vhdl/sim_xaui.vhd

...nology/ip_stratixiv/phy_xaui/tb_ip_stratixiv_phy_xaui.vhd