Blocks should be synchronized on read-only fields (#5212)

* Blocks should be synchronized on read-only fields

* more readonlys

* fix alignment

* more

* Update ISelfController.cs

* simplify new

* simplify new

src/Ryujinx.Audio/Backends/Common/DynamicRingBuffer.cs

@@ -10,7 +10,7 @@ namespace Ryujinx.Audio.Backends.Common
     {
         private const int RingBufferAlignment = 2048;
 
-        private object _lock = new object();
+        private readonly object _lock = new();
 
         private byte[] _buffer;
         private int _size;