Regenerate vulkan-loader for 1.4

Manual changes to scripts/generator_common.py, then generated by
running scripts/code_generator.py

Bug: b/370568136
Flag: NONE infeasible
Change-Id: I91937577496488b18e6972224a79de31a863c327
diff --git a/vulkan/libvulkan/driver_gen.h b/vulkan/libvulkan/driver_gen.h
index 649c0f1..204b16f 100644
--- a/vulkan/libvulkan/driver_gen.h
+++ b/vulkan/libvulkan/driver_gen.h
@@ -68,6 +68,7 @@
         EXTENSION_CORE_1_1,
         EXTENSION_CORE_1_2,
         EXTENSION_CORE_1_3,
+        EXTENSION_CORE_1_4,
         EXTENSION_COUNT,
         EXTENSION_UNKNOWN,
     };