powerpc: mpc8xx: Remove usage of common.h

Remove inclusion of common.h and add relevant
includes when necessary.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
diff --git a/arch/powerpc/cpu/mpc8xx/interrupts.c b/arch/powerpc/cpu/mpc8xx/interrupts.c
index eef1951..babef07 100644
--- a/arch/powerpc/cpu/mpc8xx/interrupts.c
+++ b/arch/powerpc/cpu/mpc8xx/interrupts.c
@@ -4,7 +4,7 @@
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  */
 
-#include <common.h>
+#include <stdio.h>
 #include <irq_func.h>
 #include <mpc8xx.h>
 #include <mpc8xx_irq.h>