Merge branch 'dpll-phase-offset-phase-adjust'

Arkadiusz Kubalewski says:

====================
dpll: add phase-offset and phase-adjust

Improve monitoring and control over dpll devices.
Allow user to receive measurement of phase difference between signals
on pin and dpll (phase-offset).
Allow user to receive and control adjustable value of pin's signal
phase (phase-adjust).

v4->v5:
- rebase series on top of net-next/main, fix conflict - remove redundant
  attribute type definition in subset definition

v3->v4:
- do not increase do version of uAPI header as it is not needed (v3 did
  not have this change)
- fix spelling around commit messages, argument descriptions and docs
- add missing extack errors on failure set callbacks for pin phase
  adjust and frequency
- remove ice check if value is already set, now redundant as checked in
  the dpll subsystem

v2->v3:
- do not increase do version of uAPI header as it is not needed

v1->v2:
- improve handling for error case of requesting the phase adjust set
- align handling for error case of frequency set request with the
approach introduced for phase adjust
====================

Signed-off-by: David S. Miller <davem@davemloft.net>