mb/lenovo/x230: Fix overridetrees not overriding

Any chip entry without a device node below them are silently dropped by
sconfig. Copy the same device node from the devicetree to prevent this.

Change-Id: I778f6b2d980e78142ae12ef941e7d9bd1f753057
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55540
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/x230/variants/x230/overridetree.cb

@@ -9,6 +9,7 @@ chip northbridge/intel/sandybridge
 			device pci 1f.0 on # LPC bridge
 				chip ec/lenovo/h8
 					register "eventa_enable" = "0x01"
+					device pnp ff.2 on end
 				end
 			end # LPC Controller
 		end

src/mainboard/lenovo/x230/variants/x230s/overridetree.cb

@@ -26,6 +26,7 @@ chip northbridge/intel/sandybridge
 					register "evente_enable" = "0x1d"
 					# X230s only has BT on wlan card
 					register "has_bdc_detection" = "0"
+					device pnp ff.2 on end
 				end
 			end # LPC Controller
 		end