Add systemd-vconsole-setup.service in initrd.target too.

When using modules plymouth and systemd, systemd-vconsole-setup.service not added to initrd.target. This leads to the fact that plymouth runs before systemd-vconsole-setup, and it breaks font in console. This patch adds systemd-vconsole-setup.service in initrd.target, which guarantees start systemd-vconsole-setup before plymouth