apm/am: Refactoring/Unstub services (#1662)

* apm: Refactoring/Unstub service

This PR implement some IPC calls of apm service:
- nn::apm::IManager is fully implemented.
- nn::apm::ISession is fully implemented (close #1633).
- nn::apm::ISystemManager is partially implemented.

nn::appletAE::ICommonStateGetter have some calls which are just a layer of apm IPC calls. What we did in some calls was wrong, it's fixed now!

Everything is checked with RE.

* abstract Apm *Server as Thog requested

* abstract ISession and fix other classes

* Address gdkchan feedback

* Fix class

* Fix Logging

Ryujinx.HLE/HOS/Services/Apm/ManagerServer.cs

@@ -0,0 +1,31 @@
+namespace Ryujinx.HLE.HOS.Services.Apm
+{
+    [Service("apm")]
+    [Service("apm:am")] // 8.0.0+
+    class ManagerServer : IManager
+    {
+        private readonly ServiceCtx _context;
+
+        public ManagerServer(ServiceCtx context) : base(context)
+        {
+            _context = context;
+        }
+
+        protected override ResultCode OpenSession(out SessionServer sessionServer)
+        {
+            sessionServer = new SessionServer(_context);
+
+            return ResultCode.Success;
+        }
+
+        protected override PerformanceMode GetPerformanceMode()
+        {
+            return _context.Device.System.PerformanceState.PerformanceMode;
+        }
+
+        protected override bool IsCpuOverclockEnabled()
+        {
+            return _context.Device.System.PerformanceState.CpuOverclockEnabled;
+        }
+    }
+}