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

Commit: edgehog/bsp/nxp/linux-seco-imx@f8191fcf

[C26] let external RTC be system default

Assign SoC RTC to rtc1, so module RTC PCF2123 can be assigned to system default rtc0.