mb/intel/coffeelake_rvp: Use CHIPSET_LOCKDOWN_COREBOOT

Currently, internal flashing is not possible due to FSP lockdown. Thus
let coreboot do chipset lockdown on all variants.

Change-Id: Ib25a0543bfee0889dce071f3b01725daabd0a0eb
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56407
Reviewed-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb b/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb
index 12b1c47..49c400f 100644
--- a/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb
+++ b/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb
@@ -1,5 +1,7 @@
 chip soc/intel/cannonlake
 
+	register "common_soc_config.chipset_lockdown" = "CHIPSET_LOCKDOWN_COREBOOT"
+
 	device cpu_cluster 0 on
 		device lapic 0 on end
 	end
diff --git a/src/mainboard/intel/coffeelake_rvp/variants/cfl_u/overridetree.cb b/src/mainboard/intel/coffeelake_rvp/variants/cfl_u/overridetree.cb
index f4b82ab..f20622c9 100644
--- a/src/mainboard/intel/coffeelake_rvp/variants/cfl_u/overridetree.cb
+++ b/src/mainboard/intel/coffeelake_rvp/variants/cfl_u/overridetree.cb
@@ -48,11 +48,9 @@
 	#+-------------------+---------------------------+
 	#| Field             |  Value                    |
 	#+-------------------+---------------------------+
-	#| chipset_lockdown  | CHIPSET_LOCKDOWN_COREBOOT |
 	#| I2C3              | Audio                     |
 	#+-------------------+---------------------------+
 	register "common_soc_config" = "{
-		.chipset_lockdown = CHIPSET_LOCKDOWN_COREBOOT,
 		.i2c[3] = {
 			.speed = I2C_SPEED_STANDARD,
 			.rise_time_ns = 104,