This effectively partially reverts "rules: remove all power management from udev" / e2452eef02a839e1928f4ffd893c93a460474ab6. The rules for emulated QEMU hardware were removed in one fell swoop with other rules which were causing problems. But the qemu rules were working properly (and were adjusted through patches over time). Nowadays we have a hwdb for this, so add hwdb entries using the new detailed modalias. https://github.com/systemd/systemd/pull/353#issuecomment-658810289
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