AP_Camera: move some includes to backend

also remove some redundant includes

libraries/AP_Camera/AP_Camera.cpp

@@ -4,12 +4,8 @@
 
 #include <AP_Math/AP_Math.h>
 #include <AP_HAL/AP_HAL.h>
-#include <GCS_MAVLink/GCS_MAVLink.h>
-#include <GCS_MAVLink/GCS.h>
 #include <SRV_Channel/SRV_Channel.h>
-#include <AP_Logger/AP_Logger.h>
 #include <AP_GPS/AP_GPS.h>
-#include <AP_Mount/AP_Mount.h>
 #include "AP_Camera_Backend.h"
 #include "AP_Camera_Servo.h"
 #include "AP_Camera_Relay.h"

libraries/AP_Camera/AP_Camera.h

@@ -6,12 +6,9 @@
 
 #if AP_CAMERA_ENABLED
 
-#include <AP_Common/Location.h>
-#include <AP_Logger/LogStructure.h>
 #include <AP_Param/AP_Param.h>
 #include <GCS_MAVLink/GCS_MAVLink.h>
 #include "AP_Camera_Params.h"
-#include "AP_Mount/AP_Mount_config.h"
 
 #define AP_CAMERA_MAX_INSTANCES             2       // maximum number of camera backends
 

libraries/AP_Camera/AP_Camera_Backend.h

@@ -23,6 +23,8 @@
 
 #if AP_CAMERA_ENABLED
 #include "AP_Camera.h"
+#include <AP_Common/Location.h>
+#include <AP_Logger/LogStructure.h>
 
 class AP_Camera_Backend
 {