tu: Add VK_KHR_buffer_device_address stubs

dEQP-VK.api.version_check.entry_points requires us to return a function
pointer, even though the feature is optional in Vulkan 1.2.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13756>

src/freedreno/vulkan/tu_device.c

@@ -2569,3 +2569,27 @@ tu_GetPhysicalDeviceMultisamplePropertiesEXT(
    else
       pMultisampleProperties->maxSampleLocationGridSize = (VkExtent2D){ 0, 0 };
 }
+
+VkDeviceAddress
+tu_GetBufferDeviceAddress(VkDevice _device,
+                          const VkBufferDeviceAddressInfoKHR* pInfo)
+{
+   tu_stub();
+   return 0;
+}
+
+uint64_t tu_GetBufferOpaqueCaptureAddress(
+    VkDevice                                    device,
+    const VkBufferDeviceAddressInfoKHR*         pInfo)
+{
+   tu_stub();
+   return 0;
+}
+
+uint64_t tu_GetDeviceMemoryOpaqueCaptureAddress(
+    VkDevice                                    device,
+    const VkDeviceMemoryOpaqueCaptureAddressInfoKHR* pInfo)
+{
+   tu_stub();
+   return 0;
+}