soc/intel/alderlake: Set `pch_thermal_trip` for Dynamic Thermal Shutdown

Set low maximum temp threshold value used for dynamic thermal sensor
shutdown consideration.

BUG=b:193774296

Change-Id: I7ee199c19a9d926a4135eeef3b3b481fbff74a79
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>

src/soc/intel/alderlake/chipset.cb

@@ -48,6 +48,11 @@ chip soc/intel/alderlake
 		.tdp_pl4 = 123,
 	}"
 
+	# NOTE: if any variant wants to override this value, use the same format
+	# as register "common_soc_config.pch_thermal_trip" = "value", instead of
+	# putting it under register "common_soc_config" in overridetree.cb file.
+	register "common_soc_config.pch_thermal_trip" = "100"
+
 	device domain 0 on
 		device gpio 0 alias pch_gpio on end
 		device pci 00.0 alias system_agent on end