reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/krzk/linux/commit/2c1b5bcb66622b02fd156ec2fcf68c543445e890
        git remote add krzk-github https://github.com/krzk/linux
        git fetch --no-tags krzk-github b4/dt-bindings-db
        git checkout 2c1b5bcb66622b02fd156ec2fcf68c543445e890
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm olddefconfig
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash dtbs_check