Setting `--kernel-command-line` in systemd service is unmodifiable
from the bootloader kernel parameters.
`splash` together with `plymouth.ignore-serial-consoles` should be
added by the user to e.g. bootloader configuration file instead.
Signed-off-by: Piotr Łobacz <p.lobacz@welotec.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
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