Exclude SHA-224 from some reduced config examples
Besides the value as an example, this is usefull for testing the option, via
test-ref-configs.pl (which is included in all.sh).
diff --git a/configs/config-thread.h b/configs/config-thread.h
index 4fa0b8d..da8ac7a 100644
--- a/configs/config-thread.h
+++ b/configs/config-thread.h
@@ -88,6 +88,9 @@
#define MBEDTLS_ECP_MAX_BITS 256
#define MBEDTLS_MPI_MAX_SIZE 32 // 256 bits is 32 bytes
+/* Save ROM by excluded SHA-2 variant that we don't need */
+#define MBEDTLS_SHA256_NO_SHA224
+
/* Save ROM and a few bytes of RAM by specifying our own ciphersuite list */
#define MBEDTLS_SSL_CIPHERSUITES MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8