selinux: whitelist f2fs

Most AOSP has already taken care of the new file-system, f2fs,
but TouchWiz still lacks support for f2fs.

Hardcode f2fs to SELinux's whitelist allows us to fully use f2fs with seclabel
without any sepolicy editing.
selinux: whitelist sdcardfs

To extend full, proper sdcardfs support to AOSP,
we need to add sdcardfs to selinux's whitelist