70-uaccess.rules sets the uaccess tag on devices with ID_SMARTCARD_READER
set, but it is set in 99-systemd.rules .
Move this to a 60-*.rules which already matches USB CCID class, factorising
the matching, so 70-uaccess.rules sets up these devices as expected.
This adds a udev tag that is supposed to be attached to all devices
that might potentially expose a PKCS#11 slot, i.e. CCID smartcards and
similar. We can then use the appearance of devices of this type as
trigger to rescan PKCS#11 slots.
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.
