v3d: Stop advertising support for PIPE_CAP_*_COLOR_CLAMPED.

The GL frontend can lower away this deprecated GL feature for us.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8601>

src/broadcom/compiler/v3d_compiler.h

@@ -389,7 +389,6 @@ struct v3d_fs_key {
         bool sample_coverage;
         bool sample_alpha_to_coverage;
         bool sample_alpha_to_one;
-        bool clamp_color;
         bool shade_model_flat;
         /* Mask of which color render targets are present. */
         uint8_t cbufs;

src/broadcom/compiler/vir.c

@@ -960,9 +960,6 @@ v3d_nir_lower_gs_late(struct v3d_compile *c)
 static void
 v3d_nir_lower_vs_late(struct v3d_compile *c)
 {
-        if (c->vs_key->clamp_color)
-                NIR_PASS_V(c->s, nir_lower_clamp_color_outputs);
-
         if (c->key->ucp_enables) {
                 NIR_PASS_V(c->s, nir_lower_clip_vs, c->key->ucp_enables,
                            false, false, NULL);
@@ -977,9 +974,6 @@ v3d_nir_lower_vs_late(struct v3d_compile *c)
 static void
 v3d_nir_lower_fs_late(struct v3d_compile *c)
 {
-        if (c->fs_key->clamp_color)
-                NIR_PASS_V(c->s, nir_lower_clamp_color_outputs);
-
         /* In OpenGL the fragment shader can't read gl_ClipDistance[], but
          * Vulkan allows it, in which case the SPIR-V compiler will declare
          * VARING_SLOT_CLIP_DIST0 as compact array variable. Pass true as

src/broadcom/vulkan/v3dv_pipeline.c

@@ -1106,9 +1106,6 @@ pipeline_populate_v3d_fs_key(struct v3d_fs_key *key,
    key->is_lines = (topology >= PIPE_PRIM_LINES &&
                     topology <= PIPE_PRIM_LINE_STRIP);
 
-   /* Vulkan doesn't appear to specify (anv does the same) */
-   key->clamp_color = false;
-
    const VkPipelineColorBlendStateCreateInfo *cb_info =
       pCreateInfo->pColorBlendState;
 
@@ -1206,9 +1203,6 @@ pipeline_populate_v3d_vs_key(struct v3d_vs_key *key,
    const bool rba = p_stage->pipeline->device->features.robustBufferAccess;
    pipeline_populate_v3d_key(&key->base, p_stage, 0, rba);
 
-   /* Vulkan doesn't appear to specify (anv does the same) */
-   key->clamp_color = false;
-
    /* Vulkan specifies a point size per vertex, so true for if the prim are
     * points, like on ES2)
     */