arch: tile: mm: pgtable.c: Removed duplicated #include

Signed-off-by: Andrea Gelmini <[e-mail]>
Signed-off-by: Chris Metcalf <[e-mail]>

arch/tile/mm/pgtable.c

···
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
-#include <linux/smp.h>
 #include <linux/highmem.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>