mb/google/volteer/{delbin,drobit}: Use alias name for DPTF PCI device

Change-Id: If514ee7c1174d13b8ca8eb7fd20359e0730a8893
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83525
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/variants/delbin/overridetree.cb

@@ -61,7 +61,7 @@ chip soc/intel/tigerlake
 	}"
 
 	device domain 0 on
-                device pci 04.0 on
+                device ref dptf on
 			chip drivers/intel/dptf
 				## Active Policy
 				register "policies.active" = "{
@@ -123,7 +123,7 @@ chip soc/intel/tigerlake
 
 				device generic 0 on end
 			end
-		end # DPTF				0x9A03
+		end
 		device ref i2c0 on
 			chip drivers/i2c/generic
 				# register "hid" is set in variant.c because of FW_CONFIG

src/mainboard/google/volteer/variants/drobit/overridetree.cb

@@ -60,7 +60,7 @@ chip soc/intel/tigerlake
 	}"
 
 	device domain 0 on
-                device pci 04.0 on
+                device ref dptf on
 			chip drivers/intel/dptf
 				## Active Policy
 				register "policies.active" = "{
@@ -116,7 +116,7 @@ chip soc/intel/tigerlake
 
 				device generic 0 on end
 			end
-		end # DPTF
+		end
 
 		device ref tbt_pcie_rp0 on
 			probe DB_USB USB4_GEN2