mb/google/dedede/var/waddledee: Drop unused IPU devtree entry

waddledee dosn't have a MIPI camera, so drop the unused ipu devicetree
reference.

Change-Id: Ieca23f03d83fe1feeb026a923aec2c5fab6a9fe5
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91067
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

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

@@ -72,7 +72,6 @@ chip soc/intel/jasperlake
 				device generic 0 on end
 			end
 		end
-		device ref ipu on end
 		device ref south_xhci on
 			chip drivers/usb/acpi
 				device ref xhci_root_hub on