svc: Implement svcGetInfo command 0xF0000002

This retrieves:

if (curr_thread == handle_thread) {
   result = total_thread_ticks + (hardware_tick_count - last_context_switch_ticks);
} else if (curr_thread == handle_thread && sub_id == current_core_index) {
   result = hardware_tick_count - last_context_switch_ticks;
}

src/core/hle/kernel/svc.h

@@ -53,6 +53,7 @@ enum class GetInfoType : u64 {
     PrivilegedProcessId = 19,
     // 5.0.0+
     UserExceptionContextAddr = 20,
+    ThreadTickCount = 0xF0000002,
 };
 
 void CallSVC(u32 immediate);