vt_ioctl: move vt_io_fontreset out of vt_io_ioctl

This also eliminates the ifdeffery by using if and __is_defined.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200615074910.19267-36-jslaby@suse.cz


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>