Fix regression introduced in I25e757108e0dd473969fe5a192ad0733f1fe6286 "payloads/external/LinuxBoot: Clean up". Add creation of the build folder as necessary dependency. Change-Id: Ie76c914f6a705de0c275a05b5af82ac21243d522 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/77202 Reviewed-by: Marvin Drees <marvin.drees@9elements.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>