[libata] sata_svw, sata_vsc: kill iomem warnings

Now that iomap merge is close to reality, and since the warnings and
issue have been around so long, we don't need a reminder on every build
that libata needs to be converted over to iomap.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --cc drivers/ata/sata_svw.c
Simple merge

diff --cc drivers/ata/sata_vsc.c
Simple merge