This used to work only when specified via the command line
or if systemd was not being used. However, the exisistence of
20_force_driver.conf also requires dracut-pre-udev.service
to be run.
Reference: bsc#986216
After=dracut-cmdline.service
Wants=dracut-cmdline.service
ConditionPathExists=/usr/lib/initrd-release
+ConditionPathExists=|/etc/cmdline.d/20-force_drivers.conf
ConditionDirectoryNotEmpty=|/lib/dracut/hooks/pre-udev
ConditionKernelCommandLine=|rd.break=pre-udev
ConditionKernelCommandLine=|rd.driver.blacklist