Reland "Prevent vendors from accessing private VNDK libs"

This reverts commit 875fe42a.

... and fixes a bug that private VNDK libs are not accessible even to
RenderScript framework libraries (such as libRS_internal.so). This is
fixed by exceptionally allowing the private libs only to 'rs'
namespace.

Bug: 70260989
Bug: 70279973
Bug: 63878960
Test: Build for walleye and tested Photos edit.
Test: other renderscript app (camerascript) works as well
Merged-In: I3978cbe2e869f6a1c214c755ded038349bde7b6b
Change-Id: I3978cbe2e869f6a1c214c755ded038349bde7b6b
(cherry picked from commit 781c47f4)