Fix: make vndk namespace visible for 2016 Pixes

The nativeloader tries to find the 'vndk' namespace when there is a
vendor apk in the classloader paths. This can happen even for a
downloaded app if the app is using a vendor apk via <uses-library> tag.

In order to prevent the nativeloader from failing to find the vndk
namespace, the namespace is marked as visible.

Bug: 66482442
Test: download the app mentioned in the bug, it does not crash.
Merged-In: I82e2394eb6eedcb8645e1a5b3735bbfe2735b312
Change-Id: I82e2394eb6eedcb8645e1a5b3735bbfe2735b312
(cherry picked from commit 1cc09e749f196774a4e6fa4afedfd4eda623ee67)
diff --git a/rootdir/etc/ld.config.txt b/rootdir/etc/ld.config.txt
index 7f86a95..01336ff 100644
--- a/rootdir/etc/ld.config.txt
+++ b/rootdir/etc/ld.config.txt
@@ -98,6 +98,7 @@
 # This namespace is exclusively for vndk-sp libs.
 ###############################################################################
 namespace.vndk.isolated = true
+namespace.vndk.visible = true
 namespace.vndk.search.paths = /vendor/${LIB}/vndk-sp:/system/${LIB}/vndk-sp
 namespace.vndk.permitted.paths = /vendor/${LIB}/hw:/vendor/${LIB}/egl