treewide: use VARYING_BIT_*

Via Coccinelle patch generated by the following Python:

  varys = [ "POS", "COL0", "COL1", "FOGC", "TEX0", "TEX1", "TEX2", "TEX3", "TEX4",
           "TEX5", "TEX6", "TEX7", "PSIZ", "BFC0", "BFC1", "EDGE", "CLIP_VERTEX",
           "CLIP_DIST0", "CLIP_DIST1", "CULL_DIST0", "CULL_DIST1", "PRIMITIVE_ID",
           "PRIMITIVE_COUNT", "LAYER", "VIEWPORT", "FACE",
           "PRIMITIVE_SHADING_RATE", "PNTC", "TESS_LEVEL_OUTER",
           "TESS_LEVEL_INNER", "PRIMITIVE_INDICES", "BOUNDING_BOX0",
           "BOUNDING_BOX1", "VIEWPORT_MASK", "CULL_PRIMITIVE" ]
  t = """
  @@
  @@

  -(1 << VARYING_SLOT_${V})
  +VARYING_BIT_${V}

  @@
  @@

  -BITFIELD_BIT(VARYING_SLOT_${V})
  +VARYING_BIT_${V}

  @@
  @@

  -(1ull << VARYING_SLOT_${V})
  +VARYING_BIT_${V}

  @@
  @@

  -BITFIELD64_BIT(VARYING_SLOT_${V})
  +VARYING_BIT_${V}

  """
  for v in varys:
      from mako.template import Template
      print(Template(t).render(V = v))

Closes: #13453
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com> [panfrost, common]
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> [broadcom]
Reviewed-by: Corentin Noël <corentin.noel@collabora.com> [virgl]
Acked-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com> [zink]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35917>

src/amd/vulkan/nir/radv_nir_export_multiview.c

@@ -72,7 +72,7 @@ radv_nir_export_multiview(nir_shader *nir)
          nir_store_var(&b, layer, nir_load_view_index(&b), 1);
 
          /* Update outputs_written to reflect that the pass added a new output. */
-         nir->info.outputs_written |= BITFIELD64_BIT(VARYING_SLOT_LAYER);
+         nir->info.outputs_written |= VARYING_BIT_LAYER;
 
          progress = true;
          if (nir->info.stage == MESA_SHADER_VERTEX)