PCI: Add Intel SCH PCI IDs

This patch adds Intel SCH chipsets (US15W, US15L, UL11L) PCI IDs, these
IDs will be used by following SCH driver patches.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@jbarnes-t61.(none)>