audren: Fix AudioRenderer implementation (#773)

* Fix AudioRenderer implementation

According to RE:
- `GetAudioRendererWorkBufferSize` is updated and improved to support `REV7`
- `RequestUpdateAudioRenderer` is updated to `REV7` too

Should improve results on recent game and close #718 and #707

* Fix NodeStates.GetWorkBufferSize

* Use BitUtils instead of IntUtils

* Nits

Ryujinx.HLE/HOS/Services/Audio/AudioRendererManager/NodeStates.cs

@@ -0,0 +1,19 @@
+using Ryujinx.Common;
+
+namespace Ryujinx.HLE.HOS.Services.Audio.AudioRendererManager
+{
+    static class NodeStates
+    {
+        public static long GetWorkBufferSize(int totalMixCount)
+        {
+            int size = BitUtils.AlignUp(totalMixCount, AudioRendererConsts.BufferAlignment);
+
+            if (size < 0)
+            {
+                size |= 7;
+            }
+
+            return 4 * (totalMixCount * totalMixCount) + 12 * totalMixCount + 2 * (size / 8);
+        }
+    }
+}