[TF-M] adding an option to run code from RAM

Hello,

I'm proposing to add an option to support code execution from device RAM. Basically, it comes to defining a new TFM_RAM_CODE SRAM region in gcc and clang linker scripts for code with .*_ramfunc attribute. This region is intended for privileged secure code running from SRAM. With this, whenever you define an attribute e.g. my_ramfunc, this function will be placed into SRAM instead of Flash.

An example: _attribute__((section("my_ramfunc"))) void my_function(void) {};

Implementation: https://review.trustedfirmware.org/c/trusted-firmware-m/+/1815

thanks, Andrei

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