ARM: shmobile: Remove obsolete twd_local_timer declaration

The last user of twd_local_timer was removed in commit c99cd90d
("ARM: shmobile: r8a7779: Remove legacy SoC code").
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/common.h

@@ -2,7 +2,6 @@
 #define __ARCH_MACH_COMMON_H
 
 extern void shmobile_init_delay(void);
-struct twd_local_timer;
 extern void shmobile_boot_vector(void);
 extern unsigned long shmobile_boot_fn;
 extern unsigned long shmobile_boot_arg;