Remove unneeded file labels.

A previous commit (a83e0cc) already labels these with genfs_context,
which has better performance.

Bug: 62413700
Test: Built, flashed, and booted.  Verified that the files have
the correct context.

Change-Id: I464b0df30fabfc5f1c7cd7430e53e8d04bfacb53
1 file changed