x86: cherryhill: Fix DTC warning

Fix warning when compiling cherryhill.dts with latest DTC:

  "Warning (avoid_unnecessary_addr_size): /pci/pch@1f,0: unnecessary
   #address-cells/#size-cells without "ranges" or child "reg" property"

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/dts/cherryhill.dts

@@ -75,8 +75,6 @@
 		pch@1f,0 {
 			reg = <0x0000f800 0 0 0 0>;
 			compatible = "intel,pch9";
-			#address-cells = <1>;
-			#size-cells = <1>;
 
 			irq-router {
 				compatible = "intel,irq-router";