ASoC: meson: aiu-encoder-i2s: improve hw constraints checks

Valerio Setti <vsetti@baylibre.com> says:

This is a follow-up to the recently merged series reshaping the AIU
driver following the same design as AXG [1]. During the review,
Jerome pointed out that failing in hw_params() when two streams have
incompatible requirements is too late from userspace's point of view [2].

This series addresses that comment:

- Patch 1 fixes the existing bclk quirk check first: it only rejected
  one direction of the mismatch, and its interface-wide flag was
  cleared too late, making a legal reconfiguration of a single stream
  fail. This is a standalone fix and it's preparing for patch 2.

- Patch 2 is the actual answer to the review comment: the quirk
  incompatibility is expressed as hw rules on channels and sample
  bits, refined against the committed configuration of the opposite
  stream, so it becomes visible during parameter refinement. The
  hw_params() check is kept as the last backstop in case of concurrent
  refinement.

- Patch 3 applies the same philosophy to the interface-wide rate
  symmetry. Instead of manually reimplementing the check, take advantage of
  the core's 'symmetric_rate' handling.

Jerome's comment also mentioned the error returned when 'bs' is not a
multiple of 2. That one intentionally remains a hw_params() time
error: bs depends on the mclk rate, which the DAI only learns via
set_sysclk() from the machine driver's hw_params(), after parameter
refinement has already run. I don't think that can easily be expressed as
a constraint.

Final note. [1] has not been mainlined yet and it's only present in
'broonie/sound.git#for-7.3'. Therefore this series depends on commit
c7852d2dcf66 ("ASoC: meson: aiu: align I2S design to the AXG one").

[1] https://lore.kernel.org/linux-sound/20260610-reshape-aiu-as-axg-v2-0-cac3663a8b51@baylibre.com/
[2] https://lore.kernel.org/linux-sound/1jik7pebk7.fsf@starbuckisacylon.baylibre.com/

Link: https://patch.msgid.link/20260710-aiu-improve-quirk-check-v1-0-2fdd1b6f8896@baylibre.com

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