Allow access("/storage/emulated", F_OK) as well as X_OK.

This should be allowed, even though apps are not allowed to read/write
dir contents.

Bug: 162321401
Test: game that accesses it
Change-Id: Ib0bd63ffcd7e4c75ffdba827a864134eaeffb624
(cherry picked from commit 19c1a87ba36e150f7ff84310b39fa9a835bedf52)
(cherry picked from commit bc8b4460ce3349954237655fb1a4aa7f3d13417d)
1 file changed