Introduce `Bitbone dom aw` and `BitboneMm dom aw`

[martijnbastiaan]

We constantly write things like:

Wishbone dom 'Standard (SwcccRemBusWidth otherWb) (Bytes 4)

and:

( ToConstBwd Mm
, Wishbone dom 'Standard (SwcccRemBusWidth otherWb) (Bytes 4)
)

This is quite verbose and ubiquitous, so I think this warrants to type synonyms:

type Bitbone dom addressWidth = Wishbone dom 'Standard addressWidth (Bytes 4)

and

type BitboneMm dom addressWidth =
  ( ToConstBwd Mm
  , Wishbone dom 'Standard addressWidth (Bytes 4)
  )

@lmbollen Does this correspond to what we were talking about in the office?