mainboard: Use decimal for `device domain 0x0 on`

Most boards use `device domain 0 on` with zero written in decimal.
For the sake of consistency, update the remaining boards to follow suit.

Change-Id: I6e2f0a19d57cfe6fc4e4ac4d14310133ad6b01d8
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54358
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/mainboard/lenovo/x131e/devicetree.cb b/src/mainboard/lenovo/x131e/devicetree.cb
index 00b5574..7ee982f 100644
--- a/src/mainboard/lenovo/x131e/devicetree.cb
+++ b/src/mainboard/lenovo/x131e/devicetree.cb
@@ -26,7 +26,7 @@
 		end
 	end
 
-	device domain 0x0 on
+	device domain 0 on
 		subsystemid 0x17aa 0x21fe inherit
 
 		device pci 00.0 on end # Host bridge