Return `MBEDTLS_ERR_ECP_INVALID_KEY` when Cryptocell returns
`CRYS_ECPKI_BUILD_KEY_INVALID_PRIV_KEY_SIZE_ERROR`
or `CRYS_ECPKI_BUILD_KEY_INVALID_PUBL_KEY_SIZE_ERROR`,
When the key size is invalid. Found by the "ECDSA zero private parameter"
tests.
Have the HW accelearation drivers return the platform module
errors about feature unsupported, and hw acceleration failure,
because the moduel specific errors will be removed.
Cruz Monrreal
Ron Eldor