powerpc/86xx: Refactor pic init

Moved the pic initialization into its own common file and out of the board
code.  Also fixed the OF reference counting on the mpic node.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/86xx/mpc86xx.h b/arch/powerpc/platforms/86xx/mpc86xx.h
index 525ffa1..08efb57 100644
--- a/arch/powerpc/platforms/86xx/mpc86xx.h
+++ b/arch/powerpc/platforms/86xx/mpc86xx.h
@@ -15,6 +15,7 @@
  * mpc86xx_* files. Mostly for use by mpc86xx_setup().
  */
 
-extern void __init mpc86xx_smp_init(void);
+extern void mpc86xx_smp_init(void);
+extern void mpc86xx_init_irq(void);
 
 #endif	/* __MPC86XX_H__ */