Add support for multiple PHYs.

board/csb272/csb272.c

board/csb472/csb472.c

board/esd/common/misc.c

board/evb64260/eth.c

board/funkwerk/vovpn-gw/m88e6060.c

board/funkwerk/vovpn-gw/vovpn-gw.c

board/mpc8260ads/mpc8260ads.c

board/mpc8560ads/mpc8560ads.c

board/mpl/mip405/mip405.c

board/netphone/netphone.c

board/netta/netta.c

board/netta2/netta2.c

board/sbc8560/sbc8560.c

board/stxgp3/stxgp3.c

board/stxxtc/stxxtc.c

board/uc100/uc100.c

common/cmd_mii.c

common/miiphybb.c

common/miiphyutil.c

cpu/arm920t/at91rm9200/ether.c