panfrost: Add CAPFs for conservative rasterization

Just do what everybody else but Nouveau does and return 0.0f.

This prevents the repeated logging of these messages on startup:

Unexpected PIPE_CAPF 6 query
Unexpected PIPE_CAPF 7 query
Unexpected PIPE_CAPF 8 query

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

src/gallium/drivers/panfrost/pan_screen.c

@@ -398,6 +398,11 @@ panfrost_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
         case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
                 return 16.0; /* arbitrary */
 
+        case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+                return 0.0f;
+
         default:
                 debug_printf("Unexpected PIPE_CAPF %d query\n", param);
                 return 0.0;