nouveau: nak: derive From<OpFoo> for Op through a proc macro

Merged Daniel Almeida requested to merge dwlsalmeida/mesa:nak-procfrom into nak/main

Derive From for Op through a proc macro. This is much less verbose than adding a manual impl From {..} for all Ops in the NAK IR.

Signed-off-by: Daniel Almeida

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