add the IDE device ID for ATI SB700

Add the IDE device ID to atiixp_pci_tbl struct in atiixp.c for ATI SB700.

From: Henry Su <henry.su@amd.com>
Signed-off-by: Luugi Marsan <luugi.marsan@amd.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>