Integrate linux-seco-imx/d18-dt-split

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Commit: https://git.seco.com/edgehog/bsp/nxp/linux-seco-imx/-/commit/5c4e4a271f1e69f1857859473957f236cf9f4805

[D18][B79] clear dts from reference board leftover

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Commit: https://git.seco.com/edgehog/bsp/nxp/linux-seco-imx/-/commit/ccbaef376a5f2c57f932ed9e763fc8dc0d288c28

[D18][B79] split DT into SoM DT and carrier DTO

conf/SRCREV.conf

 SRCREV:pn-imx-mkimage = "088ceee66994ace0d9c296170ec51b8c7935f84d"
 SRCREV:pn-u-boot-seco-imx = "92e9d0ca5db882ab2721997d75f07c3a6989f93f"
-SRCREV:pn-linux-seco-imx = "1b6ce56cbc936a191e0721b9c05417b42a6b7130"
+SRCREV:pn-linux-seco-imx = "5c4e4a271f1e69f1857859473957f236cf9f4805"
 SRCREV:pn-u-boot-seconorth-imx = "7477fa0a389942cee3d2e275096989a69f0382f9"
 SRCREV:pn-linux-seconorth-imx = "104f5abdd4e7933fd4b795c52e1adf49430aff60"