kernel: Eliminate variable shadowing

Now that the large kernel refactor is merged, we can eliminate the
remaining variable shadowing cases.

src/core/hle/kernel/k_session.h

@@ -17,7 +17,7 @@ class KSession final : public KAutoObjectWithSlabHeapAndContainer<KSession, KAut
     KERNEL_AUTOOBJECT_TRAITS(KSession, KAutoObject);
 
 public:
-    explicit KSession(KernelCore& kernel);
+    explicit KSession(KernelCore& kernel_);
     virtual ~KSession() override;
 
     void Initialize(KClientPort* port_, const std::string& name_);