Merge pull request #2839 from Subv/global_kernel_lock

Kernel/HLE: Use a mutex  to synchronize access to the HLE kernel state between the cpu thread and any other possible threads that might touch the kernel (network thread, etc).

src/core/hle/kernel/kernel.h

@@ -132,4 +132,4 @@ void Init(u32 system_mode);
 /// Shutdown the kernel
 void Shutdown();
 
-} // namespace
+} // namespace Kernel