Make PPTC state non-static (#4157)

* Make PPTC state non-static

* DiskCacheLoadState can be null

Ryujinx.Cpu/IDiskCacheState.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Ryujinx.Cpu
+{
+    /// <summary>
+    /// Disk cache load state report and management interface.
+    /// </summary>
+    public interface IDiskCacheLoadState
+    {
+        /// <summary>
+        /// Event used to report the cache load progress.
+        /// </summary>
+        event Action<LoadState, int, int> StateChanged;
+
+        /// <summary>
+        /// Cancels the disk cache load process.
+        /// </summary>
+        void Cancel();
+    }
+}