Add MBEDTLS_LMS_PRIVATE define

To enable private key operations

Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 2921278..570d9db 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -358,6 +358,11 @@
 #error "MBEDTLS_LMS_C requires MBEDTLS_PSA_CRYPTO_C"
 #endif
 
+#if defined(MBEDTLS_LMS_PRIVATE) &&                                    \
+    ( !defined(MBEDTLS_LMS_C) )
+#error "MBEDTLS_LMS_PRIVATE requires MBEDTLS_LMS_C"
+#endif
+
 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) &&                          \
     ( !defined(MBEDTLS_PLATFORM_C) || !defined(MBEDTLS_PLATFORM_MEMORY) )
 #error "MBEDTLS_MEMORY_BUFFER_ALLOC_C defined, but not all prerequisites"