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/code-generator.tmpl b/vulkan/libvulkan/code-generator.tmpl
index 9021972..501877c 100644
--- a/vulkan/libvulkan/code-generator.tmpl
+++ b/vulkan/libvulkan/code-generator.tmpl
@@ -705,7 +705,7 @@
 VK_KHR_surface
 VK_KHR_swapchain
 VK_GOOGLE_display_timing
-VK_KHR_swapchain_front_buffered
+VK_KHR_shared_presentable_image
 {{end}}