2ac1203 kernel-install/90-loaderentry: do not override an existing systemd.machine_id

1 file Authored by Antonio Alvarez Feijoo a year ago, Committed by bluca a year ago,
    kernel-install/90-loaderentry: do not override an existing systemd.machine_id
    
    If the systemd.machine_id command line option is already set, do not override
    it.
    
    (cherry picked from commit 802d9219aa19d759113dd6cd1e91b2bb661fe9ba)