sh64: Kill off obsolete linux/blk.h reference.

This is just dead code, kill it off..
Reported-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh64/mm/init.c

@@ -22,10 +22,6 @@
 #include <asm/pgtable.h>
 #include <asm/tlb.h>
 
-#ifdef CONFIG_BLK_DEV_INITRD
-#include <linux/blk.h>
-#endif
-
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
 /*