[Intel][WDT] Based on C620 Series PCH datasheet, probe TCO devices

* C620 Series Chipset Production SKUs (`0xa1a3`)
* C620 Series Chipset Super SKUs (`0xa223`)

Author: cyring

x86_64/corefreq-api.h

@@ -1384,6 +1384,9 @@ typedef struct
 #define DID_INTEL_SKYLAKE_H_IMC_HAQ	0x1910
 /* Source: Intel Xeon Processor E3-1200 v5 Product Family		*/
 #define DID_INTEL_SKYLAKE_DT_IMC_HA	0x1918
+/* Source: Intel C620 Series Chipset Platform Controller Hub Datasheet	*/
+#define DID_INTEL_C620_PCH_SMBUS	0xa1a3
+#define DID_INTEL_C620_SUPER_SMBUS	0xa223
 /* Source:7th Generation Intel Processor for S-Platforms & Core X-Series Vol2*/
 #define DID_INTEL_KABYLAKE_H_IMC_HAD	0x5900
 #define DID_INTEL_KABYLAKE_U_IMC_HA	0x5904

x86_64/corefreqk.c

@@ -10382,6 +10382,14 @@ static void Intel_Watchdog(CORE_RO *Core)
 		.driver_data = (kernel_ulong_t) TCOBASE
 		},
 		{
+		PCI_VDEVICE(INTEL, DID_INTEL_C620_PCH_SMBUS),
+		.driver_data = (kernel_ulong_t) TCOBASE
+		},
+		{
+		PCI_VDEVICE(INTEL, DID_INTEL_C620_SUPER_SMBUS),
+		.driver_data = (kernel_ulong_t) TCOBASE
+		},
+		{
 		PCI_VDEVICE(INTEL, DID_INTEL_KBL_PCH_H_SMBUS),
 		.driver_data = (kernel_ulong_t) TCOBASE
 		},