nvc0: fix the driver cb size when draw parameters are used

nvc0: fix the driver cb size when draw parameters are used

The size of the driver constant buffer for each stage should be 2048
and not 512 because it has been increased recently for buffers/images.
While we are at it, do the same change for indirect draws.

This fixes all ARB_shader_draw_parameters tests on GM107.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: 12.0 <mesa-stable@lists.freedesktop.org>