Extend PF_FSTRANS critical regions

Extend PF_FSTRANS critical regions

Additional testing has shown that the region covered by PF_FSTRANS
needs to be extended to cover the  zpl_xattr_security_init() and
init_acl() functions.  The zpl_mark_dirty() function can also recurse
and therefore must always be protected.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Closes #3331