Make vendor_ramdisk_available.

Test: pass
Bug: 156098440
Change-Id: I8fe2deb8fa3b24c227202be02d8af648629cffeb
diff --git a/libc/async_safe/Android.bp b/libc/async_safe/Android.bp
index 98da2cc..a808dde 100644
--- a/libc/async_safe/Android.bp
+++ b/libc/async_safe/Android.bp
@@ -32,6 +32,7 @@
 cc_library_headers {
     name: "libasync_safe_headers",
     ramdisk_available: true,
+    vendor_ramdisk_available: true,
     recovery_available: true,
     native_bridge_supported: true,
     defaults: ["linux_bionic_supported"],