soc/intel/mtl: Set slp-s0 counter frequency

System sleep time (SLP_S0 signal asserted) is measured in ticks, for
Meteor Lake soc in 122us (i.e. ~8197Hz) granularity/ticks.

Change-Id: I1e95cd69e941d4d72d5c36a07660ca07ee2499ba
Signed-off-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78277
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/soc/intel/meteorlake/Kconfig

@@ -447,4 +447,10 @@ config SOC_INTEL_CSE_FW_PARTITION_CMOS_OFFSET
 	int
 	default 161
 
+config ACPI_SOC_INTEL_SLP_S0_FREQ_HZ
+	hex
+	default 0x2005
+	help
+	  slp_s0_residency granularity in 122us ticks (i.e. ~8.2KHz) in Meteor Lake.
+
 endif