arch/x86/kernel/acpi/boot.c: removed duplicated #include

Removed duplicated include file <asm/genapic.h> in
arch/x86/kernel/acpi/boot.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/acpi/boot.c

@@ -58,7 +58,6 @@ EXPORT_SYMBOL(acpi_disabled);
 #ifdef	CONFIG_X86_64
 
 #include <asm/proto.h>
-#include <asm/genapic.h>
 
 #else				/* X86 */