hoc-overlay: add fan control feature to sysmodule

Source/sys-clk/common/include/sysclk.h

@@ -21,6 +21,7 @@ extern "C" {
 #include "sysclk/apm.h"
 #include "sysclk/config.h"
 #include "sysclk/errors.h"
+#include "sysclk/psm_ext.h"
 
 #ifdef __cplusplus
 }