libcamera: fix odd include file hierarchy

There is no need for pipeline_handler.h to include camera.h, instead it
should be included in the source file which needs it;
camera_manager.cpp.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/camera_manager.cpp

@@ -5,6 +5,7 @@
  * camera_manager.h - Camera management
  */
 
+#include <libcamera/camera.h>
 #include <libcamera/camera_manager.h>
 #include <libcamera/event_dispatcher.h>
 

src/libcamera/include/pipeline_handler.h

@@ -11,8 +11,6 @@
 #include <string>
 #include <vector>
 
-#include <libcamera/camera.h>
-
 namespace libcamera {
 
 class CameraManager;