vulkan: Implement KHR_get_surface_capabilities2

Implemented by forwarding to the KHR_surface equivalents. This requires
a bit of rejigging in the case of GetPhysicalDeviceSurfaceFormats2KHR
to deal with the stride difference.

Change-Id: I0f1cc83cfc885955a39fc02d4a15609e83d36798
Test: dEQP-VK.wsi.android.surface.*2
diff --git a/vulkan/libvulkan/code-generator.tmpl b/vulkan/libvulkan/code-generator.tmpl
index 185121c..5bbe116 100644
--- a/vulkan/libvulkan/code-generator.tmpl
+++ b/vulkan/libvulkan/code-generator.tmpl
@@ -690,6 +690,7 @@
 VK_KHR_shared_presentable_image
 VK_KHR_surface
 VK_KHR_swapchain
+VK_KHR_get_surface_capabilities2
 {{end}}