sh: Kill off pgtable.h from scatterlist.h.

Fixes up the mmc build.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/scatterlist.h

 #ifndef __ASM_SH_SCATTERLIST_H
 #define __ASM_SH_SCATTERLIST_H
 
-#include <asm/pgtable.h>
 #include <asm/types.h>
 
 struct scatterlist {