Implement some calls of ISelfController (#965)

* Implement some calls of ISelfController

This PR implement some calls of ISelfController:

- EnterFatalSection
- LeaveFatalSection
- GetAccumulatedSuspendedTickValue (close #937)

According to RE of the 8.1.0 am service.

* thread safe increment/decrement

* Fix thread safe

* remove unused using

Ryujinx.HLE/HOS/Services/Am/ResultCode.cs

@@ -7,11 +7,12 @@ namespace Ryujinx.HLE.HOS.Services.Am
 
         Success = 0,
 
-        NotAvailable      = (2   << ErrorCodeShift) | ModuleId,
-        NoMessages        = (3   << ErrorCodeShift) | ModuleId,
-        ObjectInvalid     = (500 << ErrorCodeShift) | ModuleId,
-        OutOfBounds       = (503 << ErrorCodeShift) | ModuleId,
-        InvalidParameters = (506 << ErrorCodeShift) | ModuleId,
-        NullObject        = (518 << ErrorCodeShift) | ModuleId
+        NotAvailable           = (2   << ErrorCodeShift) | ModuleId,
+        NoMessages             = (3   << ErrorCodeShift) | ModuleId,
+        ObjectInvalid          = (500 << ErrorCodeShift) | ModuleId,
+        OutOfBounds            = (503 << ErrorCodeShift) | ModuleId,
+        InvalidParameters      = (506 << ErrorCodeShift) | ModuleId,
+        UnbalancedFatalSection = (512 << ErrorCodeShift) | ModuleId,
+        NullObject             = (518 << ErrorCodeShift) | ModuleId
     }
 }