[POWERPC] Fix compile issue for Efika platform

This patch fixes a compile issue for the Efika platform recently
introduced by API changes.
Signed-off-by: NNicolas DET <nd@bplan-gmbh.de>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/platforms/efika/Makefile

-obj-y += setup.o mpc52xx.o pci.o
+obj-y += setup.o pci.o

arch/powerpc/platforms/efika/setup.c

@@ -29,6 +29,7 @@
 #include <asm/machdep.h>
 #include <asm/rtas.h>
 #include <asm/of_device.h>
+#include <asm/of_platform.h>
 #include <asm/mpc52xx.h>
 
 #include "efika.h"