gallium: remove point_size_min and point_size_max from rasterizer state

The state tracker is responsible for clamping to any graphics API enforced
size min/max limits for both the static point_size setting as well as per
vertex point size (in the vertex shader).
Note that mesa state tracker didn't actually use these values.

src/mesa/state_tracker/st_atom_rasterizer.c

@@ -188,9 +188,6 @@ static void update_raster_state( struct st_context *st )
     */
    raster->point_size = ctx->Point.Size;
 
-   raster->point_size_min = 0;    /* temporary, will go away */
-   raster->point_size_max = 1000; /* temporary, will go away */
-
    raster->point_smooth = ctx->Point.SmoothFlag;
    raster->point_sprite = ctx->Point.PointSprite;
    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {