ASoC: dt-bindings: fsl,easrc: add ports binding for multiple conversion paths

The i.MX EASRC hardware supports up to four conversion contexts
(A, B, C, D). Add a ports container property to the binding to allow
each independent conversion path to be represented as an individual
audio-graph port:

  port@0 -- conversion path 0
  port@1 -- conversion path 1
  port@2 -- conversion path 2
  port@3 -- conversion path 3

Each sub-port references audio-graph-port.yaml and follows the standard
audio-graph binding conventions. Contexts are allocated dynamically at
stream open time; each active stream direction (playback or capture) on
a port consumes one hardware context.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260928061149.1844121-3-shengjiu.wang@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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