header: Update to version 1.0.67 of the Vulkan hdr

- updated vulkan.h
- updated cgenerator.py
- updated generator.py
- updated reg.py
- updated vk.xml
- updated layer json files
- updated vulkan.hpp
- updated vuid_mapping.py
- updated vk_validation_error_database.txt for spec changes, new VUIDs
- updated vk_validation_error_messages.h

Change-Id: Ifb67cf406aa82bf89e72ccfa4e1320cb3b199656