PCI: vmd: Add an additional VMD device id to driver device id table

Allow VMD devices with PCI id 8086:28c0 to bind to VMD driver.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
[lorenzo.pieralisi@arm.com: updated commit subject]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>