[Nouveau] RFC: gallium/nv50: get rid of the screen_init stateobj

[Christoph Bumiller]

Hi.
There's not much to say here, just replacing the screen_init
stateobj with direct pushbuffer emission.

We don't need to store all the usless state from init, and the
constant buffer relocations which currently don't work if the
addresses change (because the method CB_DEF_SET isn't
among them (not an address)) become effective.

Thoughts, ack / nack ?
Thanks,
  Christoph

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