ARM: S5PC100: remove useless ifdef in common.h

The mach-s5pc100 should be complied with selecting CPU_S5PC100,
so the 'ifdef' in common.h is not required.
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s5pc100/common.h

@@ -20,18 +20,9 @@ void s5pc100_setup_clocks(void);
 
 void s5pc100_restart(char mode, const char *cmd);
 
-#ifdef CONFIG_CPU_S5PC100
-
 extern  int s5pc100_init(void);
 extern void s5pc100_map_io(void);
 extern void s5pc100_init_clocks(int xtal);
 extern void s5pc100_init_uarts(struct s3c2410_uartcfg *cfg, int no);
 
-#else
-#define s5pc100_init_clocks NULL
-#define s5pc100_init_uarts NULL
-#define s5pc100_map_io NULL
-#define s5pc100_init NULL
-#endif
-
 #endif /* __ARCH_ARM_MACH_S5PC100_COMMON_H */