soc/amd/*: Hook up GPU ops in devicetree

This removes the need for a PCI driver.

Change-Id: I4b499013a80f5c1bd6ac265a5ae8e635598d9e6c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68148
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
diff --git a/src/soc/amd/mendocino/chipset_rembrandt.cb b/src/soc/amd/mendocino/chipset_rembrandt.cb
index 6397ce9..2a8d187 100644
--- a/src/soc/amd/mendocino/chipset_rembrandt.cb
+++ b/src/soc/amd/mendocino/chipset_rembrandt.cb
@@ -20,7 +20,7 @@
 		device pci 08.0 on end # Dummy Host Bridge, do not disable
 		device pci 08.1 alias gpp_bridge_a off  # Internal GPP Bridge 0 to Bus A
 			ops amd_internal_pcie_gpp_ops
-			device pci 0.0 alias gfx off end # Internal GPU (GFX)
+			device pci 0.0 alias gfx off ops amd_graphics_ops end # Internal GPU (GFX)
 			device pci 0.1 alias gfx_hda off end # Display HD Audio Controller (GFXAZ)
 			device pci 0.2 alias crypto off end # Crypto Coprocessor
 			device pci 0.3 alias xhci_0 off