Convert vulkan to Android.bp

See build/soong/README.md for more information.

Test: mma -j
Change-Id: Ic7f0af683a5ef093df718ed746a73a7fa2a9ce0b
diff --git a/vulkan/Android.bp b/vulkan/Android.bp
index d97cf5e..ba3cf79 100644
--- a/vulkan/Android.bp
+++ b/vulkan/Android.bp
@@ -20,6 +20,13 @@
     license: "include/vulkan/NOTICE",
 }
 
+cc_library_static {
+    name: "vulkan_headers",
+    export_include_dirs: ["include"],
+}
+
 subdirs = [
+    "nulldrv",
     "libvulkan",
+    "tools",
 ]