mm/page_alloc: duplicate include linux/vmalloc.h

linux/vmalloc.h is repeatedly in the file page_alloc.c

Link: https://lkml.kernel.org/r/1616468751-80656-1-git-send-email-zhouchuangao@vivo.comSigned-off-by: zhouchuangao <zhouchuangao@vivo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

@@ -72,8 +72,6 @@
 #include <linux/padata.h>
 #include <linux/khugepaged.h>
 #include <linux/buffer_head.h>
-#include <linux/vmalloc.h>
-
 #include <asm/sections.h>
 #include <asm/tlbflush.h>
 #include <asm/div64.h>