Kernel: Include the new PIT class in system components

Author: https://github.com/supercomputer7
Commit: 895e874eb4
Pull-request: https://github.com/SerenityOS/serenity/pull/1274
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/shannonbooth

Kernel/Process.cpp

@@ -32,11 +32,11 @@
 #include <AK/Time.h>
 #include <AK/Types.h>
 #include <Kernel/Arch/i386/CPU.h>
-#include <Kernel/Arch/i386/PIT.h>
 #include <Kernel/Devices/BlockDevice.h>
 #include <Kernel/Devices/KeyboardDevice.h>
 #include <Kernel/Devices/NullDevice.h>
 #include <Kernel/Devices/PCSpeaker.h>
+#include <Kernel/Devices/PIT.h>
 #include <Kernel/Devices/RandomDevice.h>
 #include <Kernel/FileSystem/Custody.h>
 #include <Kernel/FileSystem/DevPtsFS.h>