radv: fix dynamic rasterizer discard enable state

radv: fix dynamic rasterizer discard enable state

If a pipeline enables rasterizerDiscardEnable statically we have to
properly initialize the value, otherwise it won't be updated when a
new pipeline is bound.

Fixes few dEQP-VK.pipeline.extended_dynamic_state.*disable_raster.

Fixes: dd19bf9d7dd ("radv: implement dynamic rasterizer discard enable")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11242>