This is a temporary fix for replacing
PSA_WANT_KEY_TYPE_[RSA/ECC]_KEY_PAIR
with the temporary symbols
MBEDTLS_PSA_WANT_KEY_TYPE_[RSA/ECC]_KEY_PAIR_LEGACY.
Once new PSA_WANT_KEY_TYPE_[RSA/ECC]_KEY_PAIR_yyy will be used
both in library's code and tests, then this fix will be removed.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>