remove duplicated header include

This change fixes ci build error.

Change-Id: I613e90f107146bf35d34d72d4a8e78054176a582
Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>
diff --git a/pid/fancontroller.cpp b/pid/fancontroller.cpp
index 68c4f68..fc26243 100644
--- a/pid/fancontroller.cpp
+++ b/pid/fancontroller.cpp
@@ -15,8 +15,6 @@
  */
 #include "config.h"
 
-#include "config.h"
-
 #include "fancontroller.hpp"
 
 #include "tuning.hpp"