powerpc, 8xx: fix missing function declarations.

Add missing .h and add missing declarations in .h
Declare local functions as static.  Make interrupt_init_cpu function
signatures consistent with how decrementer_count is declared.

Based on warnings reported by 'make C=2'

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[trini: drop cpu_init_f as 8xx/83xx are different from the rest, rework
interrupt_init_cpu/decrementer_count]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/include/asm/ppc.h b/arch/powerpc/include/asm/ppc.h
index aa5dd85..850fe93 100644
--- a/arch/powerpc/include/asm/ppc.h
+++ b/arch/powerpc/include/asm/ppc.h
@@ -122,6 +122,10 @@
 void print_reginfo(void);
 #endif
 
+int interrupt_init_cpu(unsigned *);
+void timer_interrupt_cpu(struct pt_regs *);
+unsigned long search_exception_table(unsigned long addr);
+
 #endif /* !__ASSEMBLY__ */
 
 #ifdef CONFIG_PPC