[PSDK] Fix BATTERY_UNKNOWN_TIME value constant

Windows SDKs define this constant to 0xFFFFFFFF but we define it to 0x80000000.
As a result, when our COMPBATT driver is being tested on Windows (namely XP, Vista and 7), BATTERY_UNKNOWN_TIME is not interpreted as UNKNOWN TIME but entirely something else.

CORE-18969
CORE-19452

Author: GeoB99

sdk/include/psdk/batclass.h

@@ -65,7 +65,7 @@ DEFINE_GUID(BATTERY_TAG_CHANGE_WMI_GUID,
 #define BATTERY_UNKNOWN_CAPACITY          0xFFFFFFFF
 
 /* BatteryEstimatedTime constant */
-#define BATTERY_UNKNOWN_TIME              0x80000000
+#define BATTERY_UNKNOWN_TIME              0xFFFFFFFF
 
 #define MAX_BATTERY_STRING_SIZE           128