Mark vndk_in_system namespace as invisible

Mark vndk_in_system namespace as invisible

vndk_in_system namespace is visible currently. However, this namespace
should be invisible as it exists within vendor section and contains
system library paths, so mark this as visible can cause disallowed
access from vendor binary to system libs. This change marks
vndk_in_system namespace as invisible.

Bug: 161076708
Test: Cuttlefish Go phone GTS test passed
Change-Id: If82cc9c1cc279125bed9977d1bcdc930e45880db
Merged-In: If82cc9c1cc279125bed9977d1bcdc930e45880db