sata_mv: Fix chip type for Hightpoint RocketRaid 1740/1742

sata_mv: Fix chip type for Hightpoint RocketRaid 1740/1742

commit 4462254ac6be9150aae87d54d388fc348d6fcead upstream.

Fix chip type for the Highpoint RocketRAID 1740 and 1742 PCI cards.
These really do have Marvell 6042 chips on them, rather than the 5081 chip.

Confirmed by multiple (two) users (for the 1740), and by examining
the product photographs from Highpoint's web site.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>