soc/intel/cnl: add SLP_S0 residency register and enable LPIT support

Test: Linux adds the cpuidle sysfs interface; Windows with s0ix_enable=1
      boots without crashing with an INTERNAL_POWER_ERROR.

- Windows and Linux tested on google/akemi
- Linux tested on clevo/cml-u

Change-Id: I51fdf52419aa7f059b70a906fd8bdac88d5b6046
Tested-By: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: Michael Niewöhner <foss@mniewoehner.de>
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49046
Reviewed-by: Lance Zhao
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/cannonlake/Kconfig

@@ -87,6 +87,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK
 	select SOC_INTEL_COMMON_BLOCK_ACPI
 	select SOC_INTEL_COMMON_BLOCK_ACPI_CPPC
+	select SOC_INTEL_COMMON_BLOCK_ACPI_LPIT
 	select SOC_INTEL_COMMON_BLOCK_CHIP_CONFIG
 	select SOC_INTEL_COMMON_BLOCK_CNVI
 	select SOC_INTEL_COMMON_BLOCK_CPU

src/soc/intel/cannonlake/include/soc/pmc.h

@@ -103,6 +103,8 @@
 #define  GPE0_DWX_MASK			0xf
 #define  GPE0_DW_SHIFT(x)		(4*(x))
 
+#define SLP_S0_RES			0x193c
+
 #if CONFIG(SOC_INTEL_CANNONLAKE_PCH_H)
 /*
  * The values for GPIO_CFG in Intel Document #572235 are incorrect.