[vulkan] Return stub for vkEnumeratePhysicalDeviceGroupsKHR

The ICD loader on Fuchsia uses this.

Tbr: lfy@google.com
Change-Id: I4d497d6a7a2567d9e3e11819c3c563f35fbee02d
diff --git a/system/vulkan/goldfish_vulkan.cpp b/system/vulkan/goldfish_vulkan.cpp
index f7d288c..37a04ac 100644
--- a/system/vulkan/goldfish_vulkan.cpp
+++ b/system/vulkan/goldfish_vulkan.cpp
@@ -189,6 +189,9 @@
     if (strcmp(name, "vkEnumeratePhysicalDeviceGroups") == 0)
         return reinterpret_cast<PFN_vkVoidFunction>(
             EnumeratePhysicalDeviceGroups);
+    if (strcmp(name, "vkEnumeratePhysicalDeviceGroupsKHR") == 0)
+        return reinterpret_cast<PFN_vkVoidFunction>(
+            EnumeratePhysicalDeviceGroups);
     if (strcmp(name, "vkGetInstanceProcAddr") == 0)
         return reinterpret_cast<PFN_vkVoidFunction>(GetInstanceProcAddr);
 #ifdef VK_USE_PLATFORM_FUCHSIA