radeonsi: compute scissor from viewport in set_viewport_states

and clamp it right before emitting. This is a prerequisite for computing
the guard band.

Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Grigori Goronzy <greg@chown.ath.cx>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
2 files changed