ASoC: codecs: nau8360: Fix AB-BA deadlock in mux update

nau8360_dac_mux_put_enum() acquires nau8360->lock before the DAPM mutex,
causing an AB-BA lock inversion. This deadlocks with concurrent stream
startups or mixer updates, which acquire locks in the reverse order.

Fix this by replacing nau8360->lock with the DAPM mutex to protect
pre-checks, releasing it before calling snd_soc_dapm_put_enum_double().

Reported-by: Sashiko AI <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260908030342.222655-1-YLCHANG2@nuvoton.com?part=1
Signed-off-by: Neo Chang <YLCHANG2@nuvoton.com>
Link: https://patch.msgid.link/20260914015648.311986-3-YLCHANG2@nuvoton.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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