move systemlib/circuit_breaker.cpp to standalone lib

src/drivers/px4io/CMakeLists.txt

@@ -42,6 +42,7 @@ px4_add_module(
 		px4io_serial_f4.cpp
 		px4io_serial_f7.cpp
 	DEPENDS
+		circuit_breaker
 	)
 
 # include the px4io binary in ROMFS

src/drivers/px4io/px4io.cpp

@@ -71,7 +71,7 @@
 #include <perf/perf_counter.h>
 #include <systemlib/err.h>
 #include <parameters/param.h>
-#include <systemlib/circuit_breaker.h>
+#include <circuit_breaker/circuit_breaker.h>
 #include <systemlib/mavlink_log.h>
 
 #include <uORB/topics/actuator_controls.h>