fix(dracut-systemd): do not use Requires for vconsole-setup.service

fix(dracut-systemd): do not use Requires for vconsole-setup.service

systemd-vconsole-setup.service may fail if the user specifies a missing keymap,
see [1,2,3], or font. This is unfortunate, but the system should not refuse
boot. It is better to continue, possible without the desired font or keymap.
All other systemd services that depend on systemd-vconsole-setup.service do so
without a hard Requires=.

(In particular, systemd-vconsole-setup internally will try to do as much setup
as possible, and will load the font even if it cannot load the keymap and vice
versa.)

[1] https://fedoraproject.org/wiki/Common_F34_bugs#kbd-legacy-media
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1955162
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1955793