ASoC: dt-bindings: fsl,imx-asrc: update port binding to support multiple paths

All i.MX ASRC variants (imx35 through imx952) support up to three
conversion pairs (A, B, C). The existing binding exposed only a single
generic audio-graph port, which cannot represent independent conversion
paths when multiple pairs are in use simultaneously.

Add a ports container that enumerates up to three sub-ports, each
representing an independent conversion path:
  port@0 -- conversion path 0
  port@1 -- conversion path 1
  port@2 -- conversion path 2

Each sub-port references audio-graph-port.yaml as before. Hardware pairs
are allocated dynamically at stream open time; each active stream
direction (playback or capture) on a port consumes one hardware pair.

For backwards compatibility, keep the old single port property but mark
it deprecated. A schema constraint (not: required: [port, ports]) ensures
that both forms cannot be used at the same time. The binding example is
updated to show the preferred ports form.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260928061149.1844121-2-shengjiu.wang@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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