hv: coding style: remove no real declaration for external variable
There is no no real declaration for these external variables. So just
remove them.
@@ -137,8 +137,6 @@ struct host_gdt_descriptor {
struct host_gdt *gdt;
} __packed;
-extern struct host_gdt HOST_GDT;
-extern struct host_gdt_descriptor HOST_GDTR;
void load_gdtr_and_tr(void);
#endif /* end #ifndef ASSEMBLER */
