Current kernels with BFQ scheduler do not yet set their IO weight
through "io.weight" but through "io.bfq.weight" (using a slightly
different interface supporting only default weights, not per-device
weights). This commit enables "IOWeight=" to just to that.
This patch may be dropped at some time later.
Github-Link: https://github.com/systemd/systemd/issues/7057
Signed-off-by: Kai Krakow <kai@kaishome.de>