Update gtsysinfo for XE_HP (#81)

Author: johnmach

Source/inc/common/gtsysinfo.h

@@ -33,7 +33,7 @@ OTHER DEALINGS IN THE SOFTWARE.
 #pragma pack(push,1)
 
 // Maximums which bound all supported GT
-#define GT_MAX_SLICE                   (4)
+#define GT_MAX_SLICE                   (8) 
 #define GT_MAX_SUBSLICE_PER_SLICE      (8)
 #define GT_MAX_SUBSLICE_PER_DSS        (2) // Currently max value based on Gen12
 #define GT_MAX_DUALSUBSLICE_PER_SLICE  (6) // Currently max value based on Gen12LP