Include mcuboot_config.h from sign_key.h to fix MCUBOOT_HW_KEY compilation
#include <stddef.h>
#include <stdint.h>
+/* mcuboot_config.h is needed for MCUBOOT_HW_KEY to work */
+#include "mcuboot_config/mcuboot_config.h"
+
#ifdef __cplusplus
extern "C" {
#endif
