ARM: shmobile: sh73a0: Remove obsolete inclusion of <asm/smp_twd.h>

As of commit 9a986398 ("ARM: shmobile: Remove legacy SoC code
for SH-Mobile AG5"), this header file is no longer used.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/smp-sh73a0.c

@@ -12,7 +12,6 @@
 #include <linux/delay.h>
 
 #include <asm/smp_plat.h>
-#include <asm/smp_twd.h>
 
 #include "common.h"
 #include "sh73a0.h"