Remove a PCI ID for a raid controller from Adaptec that was planned,
but never released. Since no real hardware was released with this ID,
just drop it from the aacraid driver. This paves the path for future
drivers for hardware that actually has this ID.

Submitted by: Scott Benesh from Microsemi.
Differential Revision: https://reviews.freebsd.org/D8377
MFC After: 3 days