TinyCrypt SSL: Extend scope of SrvKeyExchange parsing

Extend scope of TC in ECDH-param extraction from CRT

Previously, TinyCrypt was only used for ECDHE-ECDSA/RSA ciphersuites.
This commit is a step towards using it for _all_ ciphersuites involving
ECDHE (specifically: ECDHE, ECDHE-PSK, static ECDH), extending the scope
of the use of TinyCrypt in the parsing of the ServerKeyExchange message.
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 22d28c9..6a90259 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -2830,9 +2830,11 @@
           MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
 #if defined(MBEDTLS_USE_TINYCRYPT)
     if( mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
-        == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
+        == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA                         ||
         mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
-        == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA )
+        == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK                         ||
+        mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
+        == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
     {
         static const unsigned char ecdh_group[] = {
             MBEDTLS_SSL_EC_TLS_NAMED_CURVE,