reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git/commit/?id=f9a301ca0e82d0bb923cddde667c4a035b8a23e9
        git remote add sudeep-holla https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git
        git fetch --no-tags sudeep-holla for-next/scmi/updates
        git checkout f9a301ca0e82d0bb923cddde667c4a035b8a23e9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/firmware/arm_scmi/