mb/siemens/mc_rpl1: Configure CPU power limits to 28W TDP

Set the CPU power limits configuration at the variant level to use 28W
for PL1, PL2. Set PL4 to 64W. This ensures consistent thermal
performance and power management behaviour.

Change-Id: I355f12ad66e9682f3d50356028baea01b42bffa3
Signed-off-by: Kilian Krause <kilian.krause@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88961
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/siemens/mc_rpl/variants/mc_rpl1/overridetree.cb

@@ -3,6 +3,12 @@ chip soc/intel/alderlake
 	# seen on J0 and Q0 SKUs
 	register "disable_package_c_state_demotion" = "true"
 
+	register "power_limits_config[RPL_P_682_482_282_28W_CORE]" = "{
+		.tdp_pl1_override = 28,
+		.tdp_pl2_override = 28,
+		.tdp_pl4 = 64,
+	}"
+
 	register "sata_salp_support" = "0"
 	register "sata_speed" = "SATA_GEN2"