Implement basic psm service (#467)

* Implement basic psm service

- Add `IPsmServer`
- Stub `GetBatteryChargePercentage` & `GetChargerType`

* Fix wrong sorting

* Add IPsmSession

- Add `IPsmSession` by Thog
- Implement `OpenSession`

Ryujinx.HLE/HOS/Services/Psm/IPsmServer.cs

@@ -0,0 +1,60 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Ipc;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.HOS.Services.Psm
+{
+    class IPsmServer : IpcService
+    {
+        enum ChargerType : int
+        {
+            None,
+            ChargerOrDock,
+            UsbC
+        }
+
+        private Dictionary<int, ServiceProcessRequest> m_Commands;
+
+        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => m_Commands;
+
+        public IPsmServer()
+        {
+            m_Commands = new Dictionary<int, ServiceProcessRequest>()
+            {
+                { 0, GetBatteryChargePercentage },
+                { 1, GetChargerType             },
+                { 7, OpenSession                }
+            };
+        }
+
+        // GetBatteryChargePercentage() -> u32
+        public static long GetBatteryChargePercentage(ServiceCtx Context)
+        {
+            int ChargePercentage = 100;
+
+            Context.ResponseData.Write(ChargePercentage);
+
+            Logger.PrintStub(LogClass.ServicePsm, $"Stubbed. ChargePercentage: {ChargePercentage}");
+
+            return 0;
+        }
+
+        // GetChargerType() -> u32
+        public static long GetChargerType(ServiceCtx Context)
+        {
+            Context.ResponseData.Write((int)ChargerType.ChargerOrDock);
+
+            Logger.PrintStub(LogClass.ServicePsm, $"Stubbed. ChargerType: {ChargerType.ChargerOrDock}");
+
+            return 0;
+        }
+
+        // OpenSession() -> IPsmSession
+        public long OpenSession(ServiceCtx Context)
+        {
+            MakeObject(Context, new IPsmSession(Context.Device.System));
+
+            return 0;
+        }
+    }
+}