Link the sanitizer runtime libraries to the default unrestricted namespace.

Without this, binaries can't be run out of /data/local/tmp on a HWASANified
device.

Bug: http://b/134503977
Test: Chromium's /data/local/tmp/md5sum/md5sum_bin works on walleye_hwasan-userdebug
Change-Id: Ieceaab8aae0024864022ca42b38aa36e6212cf31
(cherry picked from commit 563ca381)