Implement basic psm service

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

Ryujinx.Common/Logging/LogClass.cs

@@ -33,6 +33,7 @@ namespace Ryujinx.Common.Logging
         ServicePctl,
         ServicePl,
         ServicePrepo,
+        ServicePsm,
         ServiceSet,
         ServiceSfdnsres,
         ServiceSm,

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

@@ -0,0 +1,51 @@
+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             }
+            };
+        }
+
+        // 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;
+        }
+    }
+}

Ryujinx.HLE/HOS/Services/ServiceFactory.cs

@@ -16,6 +16,7 @@ using Ryujinx.HLE.HOS.Services.Nv;
 using Ryujinx.HLE.HOS.Services.Pctl;
 using Ryujinx.HLE.HOS.Services.Pl;
 using Ryujinx.HLE.HOS.Services.Prepo;
+using Ryujinx.HLE.HOS.Services.Psm;
 using Ryujinx.HLE.HOS.Services.Set;
 using Ryujinx.HLE.HOS.Services.Sfdnsres;
 using Ryujinx.HLE.HOS.Services.Sm;
@@ -146,6 +147,9 @@ namespace Ryujinx.HLE.HOS.Services
                 case "pl:u":
                     return new ISharedFontManager();
 
+                case "psm":
+                    return new IPsmServer();
+
                 case "prepo:a":
                     return new IPrepoService();