layers: Finish add support to validation for VK_KHR_display extension

Swapchain, object_tracker and unique_objects now intercept and perform
validation checks for this extension.
Change-Id: I2e78d1dc516103de165ef83b99665eaad05b73d9
diff --git a/vulkan.py b/vulkan.py
index 0048cbd..56c18b6 100644
--- a/vulkan.py
+++ b/vulkan.py
@@ -1326,6 +1326,8 @@
     "VkSwapchainKHR",
     "VkSurfaceKHR",
     "VkDebugReportCallbackEXT",
+    "VkDisplayKHR",
+    "VkDisplayModeKHR",
 ]
 
 object_type_list = object_dispatch_list + object_non_dispatch_list