HLE: Implement IHidServer IsSixAxisSensorAtRest

Fixes the actually insane amount of log spam in games that check for this, such as Luigi's Mansion 3.

Values in HidDevices.NpadDevices.isAtRest may need to be tuned to a better range for resting detection. I originally set them to 0, and my controller rests at definitely NOT 0.

Will need to be revisited when implementing functionality for the global SixAxisActive bool, IHidServer.StartSixAxisTracking, and IHidServer.StopSixAxisTracking.

src/Ryujinx.HLE/HOS/Services/Hid/HidDevices/NpadDevices.cs

@@ -56,6 +56,7 @@ namespace Ryujinx.HLE.HOS.Services.Hid
             _activeCount = 0;
 
             JoyHold = NpadJoyHoldType.Vertical;
+            SixAxisActive = false;
         }
 
         internal ref KEvent GetStyleSetUpdateEvent(PlayerIndex player)
@@ -581,6 +582,23 @@ namespace Ryujinx.HLE.HOS.Services.Hid
             return needUpdateRight;
         }
 
+        public bool isAtRest(int playerNumber)
+        {
+
+            ref NpadInternalState currentNpad = ref _device.Hid.SharedMemory.Npads[playerNumber].InternalState;
+            ref SixAxisSensorState storage = ref GetSixAxisSensorLifo(ref currentNpad, false).GetCurrentEntryRef();
+
+            float acceleration = Math.Abs(storage.Acceleration.X)
+                                 + Math.Abs(storage.Acceleration.Y)
+                                 + Math.Abs(storage.Acceleration.Z);
+
+            float angularVelocity = Math.Abs(storage.AngularVelocity.X)
+                                    + Math.Abs(storage.AngularVelocity.Y)
+                                    + Math.Abs(storage.AngularVelocity.Z);
+
+            return ((acceleration <= 1.5F) && (angularVelocity <= 1.1F));
+        }
+
         private void UpdateDisconnectedInputSixAxis(PlayerIndex index)
         {
             ref NpadInternalState currentNpad = ref _device.Hid.SharedMemory.Npads[(int)index].InternalState;