[MIPS] Fix declaration of smp_prepare_cpus() platform hook. A while ago prom_prepare_cpus was replaced by plat_prepare_cpus but the declaration has stayed unchanged. Signed-off-by: Ralf Baechle <[e-mail]>

include/asm-mips/smp.h

···
 extern void plat_smp_setup(void);
 
 /*
- * Called after init_IRQ but before __cpu_up.
+ * Called in smp_prepare_cpus.
  */
-extern void prom_prepare_cpus(unsigned int max_cpus);
+extern void plat_prepare_cpus(unsigned int max_cpus);
 
 /*
  * Last chance for the board code to finish SMP initialization before