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Fix Non-Secure stacks over-allocated issue
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The threads, which are executing the test suites allocate their own stack in the TFM_DATA section, they are not using the ARM_LIB_STACK (PSP). Furthermore, it seems that RTX also not using too much of ARM_LIB_STACK _MSP.

These memory areas could be reduced, which would be beneficial on constrained devices which are lack plenty of RAM.