[AGPGART] Really add Intel i915 AGPGART Support.

Whoops. Missing entry in the PCI ID tables.

Spotted and fixed by someone at SuSE.
Fished out of SuSE's kernel tree by Christoph Hellwig
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/intel-agp.c

@@ -1768,6 +1768,7 @@ static struct pci_device_id agp_intel_pci_table[] = {
 	ID(PCI_DEVICE_ID_INTEL_82875_HB),
 	ID(PCI_DEVICE_ID_INTEL_7505_0),
 	ID(PCI_DEVICE_ID_INTEL_7205_0),
+	ID(PCI_DEVICE_ID_INTEL_82915G_HB),
 	{ }
 };