libvulkan: update code gen templates

Update code-generator.tmpl to match the result from doing `$ apic
template ../api/vulkan.api code-generator.tmpl`.
Update null_driver.tmpl to match the result from doing `$ apic template
../api/vulkan.api null_driver.tmpl`.

Test: build
Change-Id: Idcf6c148fd0d49bb1b6a31e657e82970f52923c0
diff --git a/vulkan/nulldrv/null_driver_gen.cpp b/vulkan/nulldrv/null_driver_gen.cpp
index 92b7468..b8d7d2b 100644
--- a/vulkan/nulldrv/null_driver_gen.cpp
+++ b/vulkan/nulldrv/null_driver_gen.cpp
@@ -17,6 +17,7 @@
 // WARNING: This file is generated. See ../README.md for instructions.
 
 #include <algorithm>
+
 #include "null_driver_gen.h"
 
 using namespace null_driver;