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Description of problem:
Let's backport:
6c8fc6e377b94e26e6d03cddbf174cb27caad0a6

dracut-033-520.el7.ppc64le:
The description is vague but based on it this seems incorrect as it is referring to rd.vconsole.keymap and there is no link to see the details of the change:

       Keyboard Settings
           If you have to input passwords for encrypted disk volumes, you might want to set the keyboard layout and specify a display font.

           A typical german kernel command would contain:

               rd.vconsole.font=latarcyrheb-sun16 rd.vconsole.keymap=de-latin1-nodeadkeys rd.locale.LANG=de_DE.UTF-8

           Setting these options can override the setting stored on your system, if you use a modern init system, like systemd.

Ok, this whole bz was a mistake. We don't use this part of code in rhel.