When the key is imported into an ecp_keypair structure it is read
by means of mbedtls_mpi_read_binary_le() and then checked with
mbedtls_ecp_check_privkey() which returns error (as expected).
When the key is imported in PSA then it is read using
mbedtls_ecp_read_key() which fixes the errors in the test before
importing. This cause the test itself to fail.
As a consequence I set the dependency to ECP_C because it's the
only case in which the key is imported in an ecp_keypair structure.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
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