core_timing: Split off utility functions into core_timing_util

src/core/hle/kernel/thread.cpp

@@ -14,6 +14,7 @@
 #include "core/arm/arm_interface.h"
 #include "core/core.h"
 #include "core/core_timing.h"
+#include "core/core_timing_util.h"
 #include "core/hle/kernel/errors.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/kernel.h"