vulkan: Adjust ANDROID_native_buffer to match new shared image naming

Rename the SWAPCHAIN_IMAGE_USAGE_FRONT_BUFFER_BIT to
SWAPCHAIN_IMAGE_USAGE_SHARED_BIT, to match Khronos renames.

Change-Id: I380512a66221c8cfcc650cd7e8259a185d61604d
Test: build
diff --git a/vulkan/libvulkan/swapchain.cpp b/vulkan/libvulkan/swapchain.cpp
index ac2479a..d1582d1 100644
--- a/vulkan/libvulkan/swapchain.cpp
+++ b/vulkan/libvulkan/swapchain.cpp
@@ -793,7 +793,7 @@
     VkSwapchainImageUsageFlagsANDROID swapchain_image_usage = 0;
     if (create_info->presentMode == VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR ||
         create_info->presentMode == VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR) {
-        swapchain_image_usage |= VK_SWAPCHAIN_IMAGE_USAGE_FRONT_BUFFER_BIT_ANDROID;
+        swapchain_image_usage |= VK_SWAPCHAIN_IMAGE_USAGE_SHARED_BIT_ANDROID;
 
         err = native_window_set_shared_buffer_mode(surface.window.get(), true);
         if (err != 0) {