Kernel: Use operator ""sv in all class_name() implementations

Previously there was a mix of returning plain strings and returning
explicit string views using `operator ""sv`. This change switches them
all to standardized on `operator ""sv` as it avoids a call to strlen.

Kernel/Net/Socket.h

@@ -123,7 +123,7 @@ protected:
     size_t backlog() const { return m_backlog; }
     void set_backlog(size_t backlog) { m_backlog = backlog; }
 
-    virtual StringView class_name() const override { return "Socket"; }
+    virtual StringView class_name() const override { return "Socket"sv; }
 
     virtual void shut_down_for_reading() { }
     virtual void shut_down_for_writing() { }