Merge branch 'dpll-use-pin-owner-s-dpll-ref-for-pin-level-set-callbacks'

Ivan Vecera says:

====================
dpll: use pin owner's dpll ref for pin-level set callbacks

Pin-level attributes (frequency, phase adjust, embedded sync, reference
sync) are properties of the pin itself. The get callbacks already use
only the pin owner's DPLL reference, but the set callbacks iterate over
all registered DPLL devices, resulting in redundant HW writes for
drivers that share a pin across multiple DPLLs.

This series simplifies the set side to match the get side: call the set
callback only through the owner's reference.

Patch 1 prepares the zl3073x driver whose ref_sync_set callback had
per-channel behavior (setting priority on a single DPLL channel). It now
iterates all channels internally so it remains correct when invoked only
once.

Patch 2 drops the xa_for_each loops from dpll_pin_freq_set(),
dpll_pin_esync_set(), dpll_pin_ref_sync_state_set() and
dpll_pin_phase_adj_set(), along with the rollback logic and the per-ref
-EOPNOTSUPP validation scan. The dpll.rst documentation is updated to
reflect the new behavior.
====================

Link: https://patch.msgid.link/20260807095926.386923-1-ivecera@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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