ipa: raspberrypi: Remove extern "C" declarations

Since the controller header files are now C++ specific, remove the extern "C"
declarations.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/raspberrypi/controller/contrast_status.h

@@ -11,10 +11,6 @@
  * of contrast stretching based on the AGC histogram.
  */
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #define CONTRAST_NUM_POINTS 33
 
 struct ContrastPoint {
@@ -27,7 +23,3 @@ struct ContrastStatus {
 	double brightness;
 	double contrast;
 };
-
-#ifdef __cplusplus
-}
-#endif