Integrate meta-seco-imx/linux-seco-imx/seco_lf-5.10.y-c26-rtc

Commit: edgehog/layers/seco/meta-seco-imx@e5ee9b13

Integrate linux-seco-imx/seco_lf-5.10.y-c26-rtc

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Commit: edgehog/bsp/nxp/linux-seco-imx@a1c8a595

[C26] let external RTC be system default

Disable SoC RTC, so module RTC PCF2123 can be assigned to system default rtc0.