platform_FilePerms: update /dev/pstore

The /dev/pstore mount now has additional mount options. Expect those
now.

BUG=chromium-os:32630
TEST=parrot build, platform_FilePerms passes
CQ-DEPEND=I55ae9dfd0a69a8d3d83618ff383570fd1a473cdf

Change-Id: Id20214c1e9d268743192908716d9934dc3efb809
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/38141
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
1 file changed