ASoC: meson: axg-spdifin: use max width for rate detection

ASoC: meson: axg-spdifin: use max width for rate detection

Use maximum width between 2 edges to setup spdifin thresholds
and detect the input sample rate. This comes from Amlogic SDK and
seems to be marginally more reliable than minimum width.

This is done to align with a future eARC support.
No issue was reported with minimum width so far, this is considered
to be an update so no Fixes tag is set.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://msgid.link/r/20240223175116.2005407-5-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>