new Ethernet MAC
targets/kc705: avoid ddrphy/ethphy address conflict
ethmac: style/renaming
ethmac: use new EndpointDescription API
Merge branch 'master' of https://github.com/m-labs/misoc

Conflicts:
	misoclib/ethmac/__init__.py
	misoclib/ethmac/last_be.py
	misoclib/ethmac/preamble.py
	misoclib/ethmac/sram.py
	misoclib/ethmac/test/__init__.py
	misoclib/ethmac/test/crc_tb.py
	misoclib/ethmac/test/ethmac_tb.py
	misoclib/ethmac/test/preamble_tb.py
	targets/kc705.py
	targets/mlabs_video.py
ethmac/last_be: remove fake signal (fixed in Migen)