[nrf fromtree] net: lwm2m: Add TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 to cipher list

Add TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 to the list for use with x509
certificates. The LWM2M v1.1 specification says that a LWM2M client
which used X509 certificates must support this ciphersuite and
additional ciphersuites may be supported.

Signed-off-by: Jeroen Broersen <[email protected]>
(cherry picked from commit f889c1a)

Author: jbr-ia

subsys/net/lib/lwm2m/lwm2m_engine.c

@@ -1023,6 +1023,7 @@ static const int cipher_list_psk[] = {
 };
 
 static const int cipher_list_cert[] = {
+	MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8,
 	MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
 };