Integrate linux-imx-kuk/mx8mp_split_d18-b79_dt

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Commit: seco-ne/kernel/linux-imx-kuk@41d5b8a6

arm64:dts:imx8mp-d18: Fix RTS/CTS property for uart4

RTS and CTS are not muxed to the SMARC connector, so remove the
"fsl,uart-has-rtscts" protperty.

746-001377

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Commit: seco-ne/kernel/linux-imx-kuk@50e071c3

arm64:dts:imx8mp-d18: Add gpio-line names

BCS 746-001381

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Commit: seco-ne/kernel/linux-imx-kuk@300acd9b

arm64:dts:imx8mp-d18: Fix FNG-System boot

Add aliases for serial interfaces and rtcs.
Disable flexspi node for now, because FNG-System stucks during
boot when it is enabled.

BCS 746-001343

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Commit: seco-ne/kernel/linux-imx-kuk@8fa40ae3

arm64:dts:imx8mp-d18: Split dt into separate files for SOM and baseboard

* b79.dtsi: Carrier board
* imx8mp-d18.dtsi: LEVY d18 SoM
* seco-imx8mp-d18.dts: d18 standalone
* seco-imx8mp-d18-b79.dts: d18 + b79

BCS 746-001345