mb/google/hatch: Enable PmTimerDisabled config to reduce S0ix power usage

BRANCH=none
BUG=b:138152075
TEST=Build for cometlake board with the PmTimerDisabled policy in
devicetree set to 1.

With PmTimerDisabled = 0
>> iotools mmio_read8 0xfe0018fc
0x00

With PmTimerDisabled = 1
>> iotools mmio_read8 0xfe0018fc
0x02

Bit 1: ACPI Timer Disable (ACPI_TIM_DIS): This bit determines
whether the ACPI Timer is enabled to run.
- 0: ACPI Timer is enabled
- 1: ACPI Timer is disabled

Change-Id: I83f49505a804c99d7978e5d541ea9fe8ead9b88f
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34611
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-by: V Sowmya <v.sowmya@intel.com>

src/mainboard/google/hatch/variants/baseboard/devicetree.cb

@@ -52,6 +52,8 @@ chip soc/intel/cannonlake
 	# putting it under register "common_soc_config" in overridetree.cb file.
 	register "common_soc_config.pch_thermal_trip" = "77"
 
+	register "PmTimerDisabled" = "1"
+
 	# VR Settings Configuration for 4 Domains
 	#+----------------+-------+-------+-------+-------+
 	#| Domain/Setting |  SA   |  IA   | GTUS  |  GTS  |