staging: android: ion: Remove unused header files

seq_file.h does not need to be included,so remove it.

Signed-off-by: Yangtao Li <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/android/ion/ion.c

···
 #include <linux/mm_types.h>
 #include <linux/rbtree.h>
 #include <linux/sched/task.h>
-#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/vmalloc.h>

drivers/staging/android/ion/ion_system_heap.c

···
 #include <linux/highmem.h>
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
-#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include "ion.h"