mb/google/dedede/var/cret: Drop unused PCIe RP8

CRET uses CNVi WiFi, not discrete, and has nothing attached to this
port, so don't enable it.

TEST=build/boot CRET

Change-Id: Iac9e01c6ecd4f3f32cd1c39a87a10530a36b40a4
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90901
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/dedede/variants/cret/overridetree.cb

@@ -234,7 +234,6 @@ chip soc/intel/jasperlake
 				device i2c 40 on end
 			end
 		end
-		device ref pcie_rp8 on end
 		device ref i2c4 on
 			chip drivers/i2c/da7219
 				register "irq_gpio" = "ACPI_GPIO_IRQ_EDGE_BOTH(GPP_D16)"