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nvc0: Add NVE4 (Kepler) DMA COPY class documentation

Has been utilised within nouveau in place of the former M2MF class, which was dropped for Kepler in PGRAPH in favour of:

  • a new P2MF object that only does simple upload; and
  • PCOPY took over responsibility of M2MF's other DMA functions.

Autogenerated headers from envytools commit [ ] (under review, to be landed).

NVIDIA documentation released at: https://github.com/NVIDIA/open-gpu-doc/blob/master/classes/dma-copy/cla0b5.h

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