Fix lotsa bugs:

- Hi/Fn length fields in command structures are 18 bits (feature!), but
descriptor lengths are 16 bits.
- define dmamap maximum lengths correctly (2^18 for total length, 2^16
for segments).
- Make the defines more consistent, and add other modes
- split source_count in command descriptors into a 16 bit length, and 16bit reserved part
upshot: blocks as large as 2^18 - 8 work now for userland crypto

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