Explicitly mark dirs for testNo64 search.

untrusted_app no longer has the ability to scan the root file system.
Update testNo64 to specifically search the appropriate subdirs rather
than scanning everything under root.

(cherry-picked from: b2587793ffa878be10364f5b6835c002bcd3c4ee)

Bug: 26822621
Change-Id: Ida03aa6f33c79f6583fd90cf06649af7c5421964
1 file changed