powerpc/mpc85xx: Fix boot_flag for calling board_init_f()

baord_init_f takes one argument, boot_flag. It has not been used for
powerpc, until recently changing to use generic board architecture.
The boot flag is added as a return value from cpu_init_f().

Signed-off-by: York Sun <yorksun@freescale.com>
CC: Alexander Graf <agraf@suse.de>
diff --git a/include/common.h b/include/common.h
index 2adf5f9..13e5dc7 100644
--- a/include/common.h
+++ b/include/common.h
@@ -729,9 +729,12 @@
 #if defined(CONFIG_8xx) || defined(CONFIG_MPC8260)
 void	cpu_init_f    (volatile immap_t *immr);
 #endif
-#if defined(CONFIG_4xx) || defined(CONFIG_MPC85xx) || defined(CONFIG_MCF52x2) ||defined(CONFIG_MPC86xx)
+#if defined(CONFIG_4xx) || defined(CONFIG_MCF52x2) || defined(CONFIG_MPC86xx)
 void	cpu_init_f    (void);
 #endif
+#ifdef CONFIG_MPC85xx
+ulong cpu_init_f(void);
+#endif
 
 int	cpu_init_r    (void);
 #if defined(CONFIG_MPC8260)