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

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

Change-Id: I083c8f8e9b38ddcc217dc8bf17ae3c9473ba77e9
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54357
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/mainboard/hp/snb_ivb_laptops/devicetree.cb b/src/mainboard/hp/snb_ivb_laptops/devicetree.cb
index a449200..c57ffb6 100644
--- a/src/mainboard/hp/snb_ivb_laptops/devicetree.cb
+++ b/src/mainboard/hp/snb_ivb_laptops/devicetree.cb
@@ -15,7 +15,7 @@
 	register "gpu_panel_power_down_delay" = "230"
 	register "gpu_panel_power_up_delay" = "300"
 	register "gpu_pch_backlight" = "0x02880288"
-	device cpu_cluster 0x0 on
+	device cpu_cluster 0 on
 		chip cpu/intel/model_206ax
 			register "acpi_c1" = "1"
 			register "acpi_c2" = "3"