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TinyCrypt should be used as a replacement of legacy ECC. In particular, there shouldn't be any use of identifiers from the legacy ECC module. So far, there's the configuration option MBEDTLS_SSL_CONF_SINGLE_EC_GRP_ID that's relevant if MBEDTLS_SSL_CONF_SINGLE_CURVE is set, and which in this case must resolve to an identifier of type mbedtls_ecp_group_id indicating which single curve to enable. With the introduction of TinyCrypt, we must either change the type of this option to mbedtls_uecc_group_id, or introduce a separate compilation option. In order to avoid type confusion, this commit follows tha latter approach, introducing the configuration option MBEDTLS_SSL_CONF_SINGLE_UECC_GRP_ID that indicatesthe TinyCrypt group identifier of the single curve to use (must be Secp256r1) if MBEDTLS_SSL_CONF_SINGLE_CURVE and MBEDTLS_USE_TINYCRYPT are set.