[TF-M] platform-specific hw initialization

Hi All,

We're proposing to add an API that would allow to implement a custom post-startup initialization of hw, peripherals etc. Contrarily to SystemInit() intended for a high priority hw initialization (for example clock and power subsystems), and called on a very early boot stage from startup code, these functions are called from C code, hence variables and other drivers data are protected from being cleared up by the C library init. https://review.trustedfirmware.org/c/trusted-firmware-m/+/1973

Ken and Mate, as maintainers of the TF-M core part, could you please take a look at the patch?

Thanks, Andrey Narkevitch Cypress Semiconductor

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