vulkan: Update headers to 1.1.76

Key changes since 1.1.72:
* Added VK_KHR_draw_indirect_count
* Added VK_KHR_display_properties2

Test: build
Change-Id: I658cb86096d2fecc3b24f6e1b2febb6ce88bdf5b
diff --git a/vulkan/libvulkan/api_gen.cpp b/vulkan/libvulkan/api_gen.cpp
index 7650e0c..629ebb1 100644
--- a/vulkan/libvulkan/api_gen.cpp
+++ b/vulkan/libvulkan/api_gen.cpp
@@ -553,7 +553,11 @@
         "vkEnumeratePhysicalDeviceGroups",
         "vkEnumeratePhysicalDeviceGroupsKHR",
         "vkEnumeratePhysicalDevices",
+        "vkGetDisplayModeProperties2KHR",
+        "vkGetDisplayPlaneCapabilities2KHR",
         "vkGetInstanceProcAddr",
+        "vkGetPhysicalDeviceDisplayPlaneProperties2KHR",
+        "vkGetPhysicalDeviceDisplayProperties2KHR",
         "vkGetPhysicalDeviceExternalBufferProperties",
         "vkGetPhysicalDeviceExternalBufferPropertiesKHR",
         "vkGetPhysicalDeviceExternalFenceProperties",