Fix Failure in Cryptocell tests on Montgomrery curve #11512
After the addition of ECDH tests for curve 25519, they failed for Cryptocell, because of different endianity of the input keys and outpu calulated secret. This fix changes the input and output to correct endianity as expected by Mbed TLS and Cryptocell.
This was tested with test_suite_ecdh on target NRF52840_DK
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