nvk: Don't force sample shading when gl_SampleMaskIn[] is read

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29194>

src/nouveau/vulkan/nvk_shader.c

@@ -735,8 +735,7 @@ nvk_compile_shader(struct nvk_device *dev,
    }
 
    if (info->stage == MESA_SHADER_FRAGMENT) {
-      if (shader->info.fs.reads_sample_mask ||
-          shader->info.fs.uses_sample_shading) {
+      if (shader->info.fs.uses_sample_shading) {
          shader->min_sample_shading = 1;
       } else if (state != NULL && state->ms != NULL &&
                  state->ms->sample_shading_enable) {