soc/intel/alderlake: Add GFx Device ID 0x46a6

This CL adds support for new ADL graphics Device ID 0x46a6.

TEST=Build and boot Adlrvp board

Change-Id: I8ca875c7faf2997d207aff9e292f94a3b6311e94
Signed-off-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56026
Reviewed-by: Meera Ravindranath <meera.ravindranath@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/common/block/graphics/graphics.c b/src/soc/intel/common/block/graphics/graphics.c
index 61d39bd..b99d2a8 100644
--- a/src/soc/intel/common/block/graphics/graphics.c
+++ b/src/soc/intel/common/block/graphics/graphics.c
@@ -301,6 +301,7 @@
 	PCI_DEVICE_ID_INTEL_ADL_P_GT2_3,
 	PCI_DEVICE_ID_INTEL_ADL_P_GT2_4,
 	PCI_DEVICE_ID_INTEL_ADL_P_GT2_5,
+	PCI_DEVICE_ID_INTEL_ADL_P_GT2_6,
 	PCI_DEVICE_ID_INTEL_ADL_S_GT1,
 	PCI_DEVICE_ID_INTEL_ADL_M_GT1,
 	0,