arch/ia64/kernel/head.S: remove duplicate include

'linux/pgtable.h' included in 'arch/ia64/kernel/head.S' is duplicated.

Link: https://lkml.kernel.org/r/20210303084549.179346-1-zhang.yunkai@zte.com.cnSigned-off-by: Zhang Yunkai <zhang.yunkai@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/ia64/kernel/head.S

@@ -33,7 +33,6 @@
 #include <asm/mca_asm.h>
 #include <linux/init.h>
 #include <linux/linkage.h>
-#include <linux/pgtable.h>
 #include <asm/export.h>
 
 #ifdef CONFIG_HOTPLUG_CPU