IPC - Refactor Bcat service to use new ipc - Revisit (#4803)

* bcat ipc

* fix hipc buffer flags

* add buffer fixed size flag on generator

src/Ryujinx.Horizon/Sdk/Bcat/IDeliveryCacheProgressService.cs

@@ -0,0 +1,12 @@
+using Ryujinx.Horizon.Bcat.Ipc.Types;
+using Ryujinx.Horizon.Common;
+using Ryujinx.Horizon.Sdk.Sf;
+
+namespace Ryujinx.Horizon.Sdk.Bcat
+{
+    internal interface IDeliveryCacheProgressService : IServiceObject
+    {
+        Result GetEvent(out int handle);
+        Result GetImpl(out DeliveryCacheProgressImpl deliveryCacheProgressImpl);
+    }
+}