patch aaa092a1 in mainline.

sata_sis: fix SCR read breakage

SCR read for controllers which uses PCI configuration space for SCR
access got broken while adding @val argument to SCR accessors.  Fix
it.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Cc: Tobias Powalowski <t.powa@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>