[PATCH] ppc32: fix treeboot image entrypoint

[Eugene Surovegin]

Correctly specify treeboot based image entrypoint. Currently makefile 
uses $(ENTRYPOINT) which isn't defined anywhere. Each board port sets 
entrypoint-$(CONFIG_BOARD_NAME) instead.

Without this patch I cannot boot Ocotea (PPC440GX eval board) anymore. 
I was getting random "OS panic" errors from OpenBIOS for a while, but 
with current kernel I get them all the time (probably because image 
became bigger).

Signed-off-by: Eugene Surovegin <ebs at ebshome.net>
---

diff --git a/arch/ppc/boot/simple/Makefile b/arch/ppc/boot/simple/Makefile
index 82df88b..f3e9c53 100644
--- a/arch/ppc/boot/simple/Makefile
+++ b/arch/ppc/boot/simple/Makefile
@@ -262,11 +262,11 @@ $(images)/zImage.initrd-STRIPELF: $(obj)
 		skip=64 bs=1k
 
 $(images)/zImage-TREE: $(obj)/zvmlinux $(MKTREE)
-	$(MKTREE) $(obj)/zvmlinux $(images)/zImage.$(end-y) $(ENTRYPOINT)
+	$(MKTREE) $(obj)/zvmlinux $(images)/zImage.$(end-y) $(entrypoint-y)
 
 $(images)/zImage.initrd-TREE: $(obj)/zvmlinux.initrd $(MKTREE)
 	$(MKTREE) $(obj)/zvmlinux.initrd $(images)/zImage.initrd.$(end-y) \
-		$(ENTRYPOINT)
+		$(entrypoint-y)
 
 $(images)/zImage-PPLUS: $(obj)/zvmlinux $(MKPREP) $(MKBUGBOOT)
 	$(MKPREP) -pbp $(obj)/zvmlinux $(images)/zImage.$(end-y)