Update defconfig.common

Author: Jason2866

configs/defconfig.common

@@ -170,7 +170,7 @@ CONFIG_MBEDTLS_HARDWARE_SHA=y
 # CONFIG_MBEDTLS_X509_CSR_PARSE_C is not set
 # end of Certificates
 
-# CONFIG_MBEDTLS_ECP_C is not set
+CONFIG_MBEDTLS_ECP_C=y
 CONFIG_MBEDTLS_ECDH_C=y
 CONFIG_MBEDTLS_ECDSA_C=y
 # CONFIG_MBEDTLS_ECP_DP_SECP256R1_ENABLE is not set