layers: Remove dead update_cmd_buf_and_mem_references
layers: Remove dead update_cmd_buf_and_mem_references

No callers.

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers