ASoC: fsl: Use maple tree register cache

Several of the NXP drivers use regmaps with a rbtree register cache. Since
the maple tree cache is using a generally more modern data structure which
makes implementation choices more suitable for modern systems let's convert
these drivers to it. This should have no practical impact.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20240924-asoc-imx-maple-v1-1-8b993901f71e@kernel.org


Signed-off-by: Mark Brown <broonie@kernel.org>