ASoC: dt-bindings: sound: Prepare Ux500 audio graph links

Audio graph card drivers parse TDM slot data and continuous clock
selection from endpoint nodes. The audio graph endpoint schema describes
slot count and width directly but does not cover sparse slot masks or
continuous clocking. Reference the common TDM slot schema so TX and RX
masks are documented, and add the continuous-clock flag.

Replace the incomplete Ux500 MSP text binding with a DT schema that
describes the clocks, reset, DMA channels and power supply consumed by
the driver. Define the MSP as a zero-cell sound DAI provider and allow
it to expose an audio graph port.

Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260918-ux500-simple-sound-v2-1-88d29416e3c3@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

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