powerpc/bootwrapper: update for initrd with simpleImage

This change to the makefile corrects the build of a simpleImage with initrd.

Signed-off-by: John Linn <john.linn@xilinx>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 1cee2f9..095e04d 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -273,7 +273,8 @@
 initrd-  := $(patsubst zImage%, zImage.initrd%, $(image-n) $(image-))
 initrd-y := $(patsubst zImage%, zImage.initrd%, \
 		$(patsubst dtbImage%, dtbImage.initrd%, \
-		$(patsubst treeImage%, treeImage.initrd%, $(image-y))))
+		$(patsubst simpleImage%, simpleImage.initrd%, \
+		$(patsubst treeImage%, treeImage.initrd%, $(image-y)))))
 initrd-y := $(filter-out $(image-y), $(initrd-y))
 targets	+= $(image-y) $(initrd-y)