Move architecture specific globals to external header, as ex. there is no GDT on ARM

xtoskrnl/includes/globals.h

@@ -10,17 +10,9 @@
 #define __XTOSKRNL_GLOBALS_H
 
 #include <xtos.h>
+#include ARCH_HEADER(globals.h)
 
 
-/* Initial GDT */
-EXTERN KGDTENTRY ArInitialGdt[GDT_ENTRIES];
-
-/* Initial IDT */
-EXTERN KIDTENTRY ArInitialIdt[IDT_ENTRIES];
-
-/* Initial TSS */
-EXTERN KTSS ArInitialTss;
-
 /* FrameBuffer information */
 EXTERN HAL_FRAMEBUFFER_DATA HlpFrameBufferData;