ARM: shmobile: Remove mach/system.h

The file <mach/system.h> is no longer included from anywhere so
clean up the code by removing mach-shmobile/include/mach/system.h

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/include/mach/system.h

@@ -1,11 +0,0 @@
-#ifndef __ASM_ARCH_SYSTEM_H
-#define __ASM_ARCH_SYSTEM_H
-
-#include <asm/system_misc.h>
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-	soft_restart(0);
-}
-
-#endif