vulkan: KHR_swapchain_front_buffered -> KHR_shared_presentable_image

Tracking Khronos naming churn
V2: More churn, no longer shared_image_swapchain.

Test: build
Change-Id: I88b11b47f2fd2f96e1f27f900a65b599aec470af
diff --git a/vulkan/libvulkan/driver_gen.h b/vulkan/libvulkan/driver_gen.h
index a137ab6..9f3b705 100644
--- a/vulkan/libvulkan/driver_gen.h
+++ b/vulkan/libvulkan/driver_gen.h
@@ -40,7 +40,7 @@
         KHR_surface,
         KHR_swapchain,
         GOOGLE_display_timing,
-        KHR_swapchain_front_buffered,
+        KHR_shared_presentable_image,
 
         EXTENSION_CORE,  // valid bit
         EXTENSION_COUNT,