HKDF On Target Test crashes

[RonEld]

Description

• Type: Bug
• Priority: Major
  On Target Test for HKDF crashes with a stack overflow. This is because the hkdf test consumes ~6KB of stsck in locsl buffers, and many Mbed OS platforms have only 4KB of stack.
  This issue is opened for tracking, and fixed by Reduce Stack usage of hkdf test function #2192

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Bug

OS
Mbed OS

mbed TLS build:
Version: 2.13.0

Expected behavior
Test to pass
Actual behavior
Tst crashes with Stack overflow
Steps to reproduce
Generate and run the HKDF On Target Test. Tested on NRF52840_DK, but it should reproduce on most Mbed OS platform, which have 4 KB stack

[ciarmcom]

ARM Internal Ref: IOTSSL-2628