[Vulkan] Implement ClearCaches and don't do it for pipelines

src/xenia/gpu/vulkan/vulkan_command_processor.h

@@ -62,6 +62,8 @@ class VulkanCommandProcessor : public CommandProcessor {
                          kernel::KernelState* kernel_state);
   ~VulkanCommandProcessor();
 
+  void ClearCaches() override;
+
   void TracePlaybackWroteMemory(uint32_t base_ptr, uint32_t length) override;
 
   void RestoreEdramSnapshot(const void* snapshot) override;