Add PCI ID for Promise TX8660 8-port 3Gbps HBA.

This device reports RAID subclass, but appears to be AHCI compatible.

Submitted by:	Yuri Perejilin <yuri@rivera.ru>
MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271403 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f