Expose ArEnableExtendedPhysicalAddressing function in XTDK

sdk/xtdk/amd64/arfuncs.h

@@ -24,6 +24,10 @@ XTCDECL
 BOOLEAN
 ArCpuId(IN OUT PCPUID_REGISTERS Registers);
 
+XTCDECL
+VOID
+ArEnableExtendedPhysicalAddressing(IN ULONG_PTR PageMap);
+
 XTCDECL
 VOID
 ArHalt(VOID);