Same approach as used in 70-mouse.rules, allow for a name-based match
optionally combined with bus/vid/pid (which the existing modalias rule
would already allow us anyway). Note that ID_BUS isn't assigned until
after this rule has run so we need to use the id/bustype attribute
directly.
Related to https://github.com/systemd/systemd/issues/36677
This change is only about the source tree. We have tmpfiles.d/, modprobe.d/,
sysctl.d/, and sysusers.d/, but for historical reasons, rules/ didn't fit this
pattern. We also *install* it as rules.d/. Let's rename to be consistent.