soc/intel/alderlake: Add GFx Device ID 0x46c3

This CL adds support for new ADL-M graphics Device ID 0x46c3.

TEST=boot to OS

Change-Id: Ib55fb501f96fe9bcc328202511bbfe84a3122285
Signed-off-by: Selma Bensaid <selma.bensaid@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57993
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/include/device/pci_ids.h

@@ -3880,6 +3880,7 @@
 #define PCI_DEVICE_ID_INTEL_ADL_S_GT1			0x4680
 #define PCI_DEVICE_ID_INTEL_ADL_M_GT1			0x46c0
 #define PCI_DEVICE_ID_INTEL_ADL_M_GT2			0x46aa
+#define PCI_DEVICE_ID_INTEL_ADL_M_GT3                   0x46c3
 
 /* Intel Northbridge Ids */
 #define PCI_DEVICE_ID_INTEL_APL_NB		0x5af0