Without this, each build will try to update the submodules. Not necessarily a problem but git locks repos, creating spurious error messages. Change-Id: Iba20677d4b5f9365c92f7ed247ca56acb7d33b27 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/42774 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>