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[C25] Make a board reset function work in U-Boot

Mikhail Vanyulin requested to merge seco_lf_v2021.04_develop_c25_fix_reset into seco_lf_v2021.04_develop_c25

For some reason, a standard reset routine, which is implemented via CONFIG_SYSRESET_PSCI driver, does not work on C25.

To work around the problem, a new reset driver (CONFIG_SYSRESET_SECO_C25) is implemented, which performs a system reset by using the onboard STM32 embedded controller (by analogy with the Watchdog functionality).

Herewith CONFIG_SYSRESET_PSCI is disabled in U-Boot config now.

Edited by Mikhail Vanyulin

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