dax: ->direct_access does not sleep anymore

In Patch:
	[7a862fbb] brd: remove dax support

  Dan Williams has removed the only might_sleep
  implementation of ->direct_access.
  So we no longer need to check for it.

CC: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Boaz Harrosh <boazh@netapp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>