ppc: cleanup compiler errors/warnings

Current u-boot top of tree builds with warnings/errors for
the following boards:

ads5121 cpci5200 mecp5200 v38b IAD210 MBX MBX860T NX823
RPXClassic debris PN62

following patch solves this.

Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/board/pn62/pn62.c b/board/pn62/pn62.c
index 53d7e57..676f8d3 100644
--- a/board/pn62/pn62.c
+++ b/board/pn62/pn62.c
@@ -22,6 +22,7 @@
 
 #include <common.h>
 #include <mpc824x.h>
+#include <net.h>
 #include <pci.h>
 #include <netdev.h>