
Fastboot devices need an indirection for creating a boot image via `mkbootimg`, so we need to propagate the cmdline from LAVA and our extra arguments to it properly. This commit fixes it by retrieving the default cmdline from LAVA and sending it, together with the `extra_nfsroot_args` to the `mkbootimg` command. Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29611>