Make libyuv_static as vendor_available lib

The lib is used by camera.ranchu. Furthermore, its dynamic variant is
already available to vendor.

Bug: 64704866
Test: BOARD_VNDK_VERSION=current m -j camera.ranchu does not show
link_type error on libyuv_static.

Change-Id: I3fa0ae866b301500f70f01b9e96afd769e1c4923
diff --git a/files/Android.bp b/files/Android.bp
index 2864b97..aec37e9 100644
--- a/files/Android.bp
+++ b/files/Android.bp
@@ -67,6 +67,7 @@
 // with libyuv (b/37646797)
 cc_library_static {
     name: "libyuv_static",
+    vendor_available: true,
     whole_static_libs: ["libyuv"],
 }