First set of counter subsystem new feature support for the 5.16 cycle

Most interesting element this time is the new chrdev based interface
for the counter subsystem.  Affects all drivers. Some minor precursor
patches.

Major parts:
* Bring all the sysfs attribute setup into the counter core rather than
  leaving it to individual drivers.  Docs updates accompany these changes.
* Move various definitions to a uapi header as now needed from userspace.
* Add the chardev interface + extensive documentation and example tool
* Add new ABI needed to identify indexes needed for chrdev interface
* Implement new interface for the 104-quad-8
* Follow up deals with wrong path for documentation build
* Various trivial cleanups and missing feature additions related to this
  series
-----BEGIN PGP SIGNATURE-----

iQJFBAABCAAvFiEEbilms4eEBlKRJoGxVIU0mcT0FogFAmFtvWMRHGppYzIzQGtl
cm5lbC5vcmcACgkQVIU0mcT0FohYnQ//U58yVdWHoav81bm08xl38Hv3F1O9Gk1E
1pWVb2FNn065q9ES9n0YB1UjECRU/4zvEw+5S+vRqfXlbQiUMVvgUSDWWokzK4Zf
rMxRFeYjzS89A8b+VoTLSxOn5wAWUc67v29HMDl1MiQHG6gP9UW7mxBbCIeIU9Et
BhNpo32IS9Qu9LeoaPsRz8yEfAyBheLGMfrlJAYy6ENTh4EMdyhzLvVlJXiE+rm7
8KwFU7XVTdIG8JQxJGSs9/CMd6CGhKaBr+B6LG4rnSZTy5k41a1DXpIBQU24nLns
ofX+KllTCnuHW5g+rqi05FkNApCN06RCV7FgUKmqOCa4vbXVEF4mFXejkQo+mgIS
zHy7lLfkiYVNprpKRKZv5lzj1go8cl4OB0F5odyaiRVh8KeCS9UbYe5fV3vLTiY9
2/yhmW/dbaogM0bFsx8pbWdn84MiBNXT/PvyqJ+I0EfndDZcmrl0mPWQlAS31QPC
3aS2wKyBt2pjTUQIaPq80xPeWAAVCVQ4IxrV5SLT8BUxJc6YwZUDEMAM+/3oEhFC
f1/fxqpcctoFEauJXrggiQWpcVbYkbA9RzF+ecUT+3ngABlbf0KOI0+RZnn6GVvJ
UVM99Dy0q5utkzFXsHZ4FjXhxiW9LcbvU27KbyrZjKJjOoQAs9Ky5uhjt5DKXh4B
KSofs8zHEs8=
=AaeD
-----END PGP SIGNATURE-----