dt-bindings: dsp: fsl,dsp: Add resets property

Assert and deassert functionality of the DSP found on i.MX8MP is
realized by combining control bits from two modules: Audio Block
Control and Debug Access Port.

Audio block control bits are used to Run/Stall the DSP core
while the DAP bits are used for software reset the core.

The original plan was to use fsl,dsp-ctrl property and to refer the
audiomix bits via syscon interface. This proposal received NACK from
community we shouldn't abuse the syscon interface [1].

So remove fsl,dsp-ctrl property for i.MX8MP and use reset control
interface instead.

Example dts node only uses runstall control now, but softreset will
be added in the future when we will convert the softreset functionality
to use reset controller API.

[1] https://patchwork.kernel.org/project/imx/patch/20250212085222.107102-6-daniel.baluta@nxp.com/

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20250311085812.1296243-3-daniel.baluta@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

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