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/lenovo/t440p/devicetree.cb b/src/mainboard/lenovo/t440p/devicetree.cb
index 8db28cb..590004a 100644
--- a/src/mainboard/lenovo/t440p/devicetree.cb
+++ b/src/mainboard/lenovo/t440p/devicetree.cb
@@ -13,7 +13,7 @@
 		.backlight_pwm_hz	= 220,
 	}"
 	register "ec_present" = "true"
-	device cpu_cluster 0x0 on
+	device cpu_cluster 0 on
 		chip cpu/intel/haswell
 			device lapic 0x0 on end
 			device lapic 0xacac off end