[PATCH] ppc32: fix treeboot image entrypoint

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@ebshome.net>
Acked-by: Tom Rini <trini@kernel.crashing.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/boot/simple/Makefile

@@ -262,11 +262,11 @@ $(images)/zImage.initrd-STRIPELF: $(obj)/zvmlinux.initrd
 		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)