The function backing_ops->read_mfc_tagstatus() doesn't return a
correct value because the dma_tagstatus_R register isn't saved in
CSA.  This fixes the problem.
Signed-off-by: NKazunori Asayama <asayama@sm.sony.co.jp>
Signed-off-by: NJeremy Kerr <jk@ozlabs.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>