added circuit_breaker_enabled_by_val()

added and using circuit_breaker_enabled_by_val() where possible instead of circuit_breaker_enabled() which search for cbrk parameters by name, which is extensive process.

src/lib/circuit_breaker/circuit_breaker.cpp

@@ -53,3 +53,8 @@ bool circuit_breaker_enabled(const char *breaker, int32_t magic)
 
 	return (PX4_PARAM_GET_BYNAME(breaker, &val) == 0) && (val == magic);
 }
+
+bool circuit_breaker_enabled_by_val(int32_t breaker_val, int32_t magic)
+{
+	return (breaker_val == magic);
+}