ASoC: fsl_asrc/fsl_easrc: expose per-pair/context DAIs and fix DMA race

Shengjiu Wang <shengjiu.wang@nxp.com> says:

This series extends the i.MX ASRC and EASRC drivers to expose one DAI
per hardware conversion pair/context, allowing multiple independent
conversion paths to be active simultaneously.

Patches 1-2 update the DT bindings to add a ports container so each
conversion path can be wired independently in the audio graph.  The old
single port property is kept but marked deprecated.

Patch 3 moves dma_params into struct fsl_asrc_pair so each pair owns its
own copy, and registers it with the cpu DAI using per-direction setters in
fsl_asrc_dma_startup().  This removes the per-DAI probe callbacks from
fsl_asrc.c and fsl_easrc.c, which are no longer needed.

Patches 4-5 expose the individual DAIs: fsl_asrc registers three DAIs
(asrc-0/1/2) and fsl_easrc registers four (easrc-0/1/2/3).  The first
DAI in each driver retains the original generic stream names for
backward compatibility with existing machine drivers.

Link: https://patch.msgid.link/20260928061149.1844121-1-shengjiu.wang@oss.nxp.com

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