anv: allow stencil memory export

This commit reverts 58e9371141 as now iris driver can import stencil.
This makes ext_external_objects-vk-stencil-display pass and X-Plane 11
vulkan rendering backend to work with anv + iris.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eleni Maria Stea <elene.mst@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10609>

src/intel/vulkan/anv_formats.c

@@ -1393,15 +1393,6 @@ VkResult anv_GetPhysicalDeviceImageFormatProperties2(
        */
       switch (external_info->handleType) {
       case VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT:
-
-         /* Disable stencil export, there are issues. */
-         if (vk_format_aspects(base_info->format) & VK_IMAGE_ASPECT_STENCIL_BIT) {
-            result = vk_errorfi(instance, &physical_device->vk.base,
-                                VK_ERROR_FORMAT_NOT_SUPPORTED,
-                                "External stencil buffers are not supported yet");
-            goto fail;
-         }
-
          if (external_props) {
             if (tiling_has_explicit_layout) {
                /* With an explicit memory layout, we don't care which type of fd