AreaKeeper: Move to kernel/util.

This seems more consistent with how the directories are laid out.

src/add-ons/kernel/busses/agp_gart/intel_gart.cpp

@@ -12,7 +12,6 @@
  */
 
 
-#include <AreaKeeper.h>
 #include <intel_extreme.h>
 
 #include <stdlib.h>
@@ -20,6 +19,7 @@
 #include <AGP.h>
 #include <KernelExport.h>
 #include <PCI.h>
+#include <util/AreaKeeper.h>
 
 #include <new>
 

src/add-ons/kernel/drivers/graphics/intel_extreme/intel_extreme.cpp

@@ -16,9 +16,9 @@
 #include <string.h>
 #include <errno.h>
 
-#include <AreaKeeper.h>
 #include <boot_item.h>
 #include <driver_settings.h>
+#include <util/AreaKeeper.h>
 #include <util/kernel_cpp.h>
 
 #include <vesa_info.h>

src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp

@@ -23,9 +23,9 @@
 #include <errno.h>
 
 #include <ACPI.h>
-#include <AreaKeeper.h>
 #include <boot_item.h>
 #include <driver_settings.h>
+#include <util/AreaKeeper.h>
 #include <util/kernel_cpp.h>
 #include <vm/vm.h>
 

src/add-ons/kernel/drivers/power/pch_thermal/pch_thermal.cpp

@@ -7,12 +7,12 @@
  */
 
 
-#include <AreaKeeper.h>
 #include <Drivers.h>
 #include <Errors.h>
 #include <KernelExport.h>
 #include <PCI.h>
 #include <bus/PCI.h>
+#include <util/AreaKeeper.h>
 
 #include <stdio.h>
 #include <stdlib.h>