setup.py: Update for consistency with other setup.py scripts.

CONTRIBUTORS: Update.

test/test_phy: Update.

setup.py: Switch minimum Python version to 3.7 (To allow more than 25…

…5 arguments in functions).

phy: Update with LiteX improvements.

bench: Remove add_csr calls (no longer required).

bench: Remove add_csr calls (no longer required).

CONTRIBUTORS: Update.

CONTRIBUTORS: Update.

Merge pull request #29 from mkj/matt/frontend

frontend: Add missing __init__.py