layers: Add tracking for VK_KHR_display extension in PV

Signed-off-by: Chris Forbes <chrisforbes@google.com>
diff --git a/layers/parameter_validation.cpp b/layers/parameter_validation.cpp
index c5cfbba..0440b68 100644
--- a/layers/parameter_validation.cpp
+++ b/layers/parameter_validation.cpp
@@ -1604,6 +1604,9 @@
             instance_extension_map[dispatch_table].win32_enabled = true;
         }
 #endif
+        if (strcmp(pCreateInfo->ppEnabledExtensionNames[i], VK_KHR_DISPLAY_EXTENSION_NAME) == 0) {
+            instance_extension_map[dispatch_table].display_enabled = true;
+        }
     }
 }