clkrst: Stub/Implement IClkrstManager and IClkrstSession calls (#2692)

This PR stubs and implements some clkrst call because they are used to overclock the Switch hardware and it's pointless in our case as we emulate the system.
Everything was done checked by RE.

Fixes #2686

Ryujinx.HLE/HOS/Services/Pcv/Rtc/IRtcManager.cs

@@ -0,0 +1,8 @@
+namespace Ryujinx.HLE.HOS.Services.Pcv.Rtc
+{
+    [Service("rtc")] // 8.0.0+
+    class IRtcManager : IpcService
+    {
+        public IRtcManager(ServiceCtx context) { }
+    }
+}