r600/sfn: Fix warning about overloads hiding virtual functions

Fixes multiple warnings when building with g++ 13.1.1 that look like

```
./src/gallium/drivers/r600/sfn/sfn_scheduler.cpp:1111:9: warning: ‘virtual void r600::CheckArrayAccessVisitor::visit(const r600::InlineConstant&)’ was hidden [-Woverloaded-virtual=]
 1111 |    void visit(const InlineConstant& value) override {(void)value;}
      |         ^~~~~
../src/gallium/drivers/r600/sfn/sfn_scheduler.cpp:1125:9: note:   by ‘virtual void r600::UpdateArrayWrite::visit(const r600::LocalArrayValue&)’
 1125 |    void visit(const LocalArrayValue& value) override {
      |         ^~~~~
(...)
```

What's going on here is when mixing overloading and virtual functions,
compiler will warn when one of the variants is not overriden.  So tell
it to also use the base class definitions.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23509>

src/gallium/drivers/r600/sfn/sfn_scheduler.cpp

@@ -1104,6 +1104,7 @@ BlockScheduler::collect_ready_type(std::list<T *>& ready, std::list<T *>& availa
 
 class CheckArrayAccessVisitor : public  ConstRegisterVisitor {
 public:
+   using ConstRegisterVisitor::visit;
    void visit(const Register& value) override {(void)value;}
    void visit(const LocalArray& value) override {(void)value;}
    void visit(const UniformValue& value) override {(void)value;}