panvk: Kill panvk_{Create,Destroy}SamplerYcbcrConversion()

The vk runtime provides a default implementation, drop the stubs we
had.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28104>

src/panfrost/vulkan/panvk_descriptor_set.c

@@ -312,21 +312,3 @@ panvk_FreeDescriptorSets(VkDevice _device, VkDescriptorPool descriptorPool,
    }
    return VK_SUCCESS;
 }
-
-VKAPI_ATTR VkResult VKAPI_CALL
-panvk_CreateSamplerYcbcrConversion(
-   VkDevice device, const VkSamplerYcbcrConversionCreateInfo *pCreateInfo,
-   const VkAllocationCallbacks *pAllocator,
-   VkSamplerYcbcrConversion *pYcbcrConversion)
-{
-   panvk_stub();
-   return VK_SUCCESS;
-}
-
-VKAPI_ATTR void VKAPI_CALL
-panvk_DestroySamplerYcbcrConversion(VkDevice device,
-                                    VkSamplerYcbcrConversion ycbcrConversion,
-                                    const VkAllocationCallbacks *pAllocator)
-{
-   panvk_stub();
-}