ACPI: DPTF: Add support for high frequency impedance notification

Add high frequency impedance notification support under DPTF.
This returns high frequency impedance value that can be obtained
from battery fuel gauge whenever there is change over a threshold.
Also, corrected the typo from IMPEDANCED_CHNGED to IMPEDANCE_CHANGED.

Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/dptf/dptf_power.c

@@ -115,7 +115,7 @@ static const struct attribute_group dptf_battery_attribute_group = {
 #define POWER_STATE_CHANGED		0x81
 #define STEADY_STATE_POWER_CHANGED	0x83
 #define POWER_PROP_CHANGE_EVENT	0x84
-#define IMPEDANCED_CHNGED		0x85
+#define IMPEDANCE_CHANGED		0x85
 #define VOLTAGE_CURRENT_CHANGED	0x86
 
 static long long dptf_participant_type(acpi_handle handle)
@@ -148,6 +148,9 @@ static void dptf_power_notify(acpi_handle handle, u32 event, void *data)
 	case STEADY_STATE_POWER_CHANGED:
 		attr = "max_steady_state_power_mw";
 		break;
+	case IMPEDANCE_CHANGED:
+		attr = "high_freq_impedance_mohm";
+		break;
 	case VOLTAGE_CURRENT_CHANGED:
 		attr = "no_load_voltage_mv";
 		break;