Extend the TX descriptor debug printing to be properly aware of

EDMA code.

* create a new TX EDMA descriptor struct to represent TX EDMA descriptors
  when doing debugging;
* implement an EDMA printing function which:
  + hardcodes the TX map size to 4 for now;
  + correctly prints out the number of segments - there's one descriptor
    for up to 4 buffers (segments), not one for each segment;
  + print out 4 DS buffer and len pointers;
  + print out the correct number of DWORDs in the TX descriptor.

TODO:

* Remove all of the hard-coded stuff. Ew.

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