MIPS: remove orphan sni_cpu_time_init() declaration

All uses of sni_cpu_time_init() were removed by
commit 4b550488f8 ("[MIPS] Deforest the function pointer jungle
in the time code."), so remove the orphan declaration, too.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/sni.h

@@ -226,9 +226,6 @@ extern void sni_pcit_cplus_irq_init(void);
 extern void sni_rm200_irq_init(void);
 extern void sni_pcimt_irq_init(void);
 
-/* timer inits */
-extern void sni_cpu_time_init(void);
-
 /* eisa init for RM200/400 */
 #ifdef CONFIG_EISA
 extern int sni_eisa_root_init(void);