tools: cbootimage: depend on automake

Fix missing aclocal reported by buildbot.

Fixes: 8595bb0 ("tools: add cbootimage for tegra")
Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

tools/Makefile

@@ -77,7 +77,7 @@ $(curdir)/zlib/compile := $(curdir)/cmake/compile
 $(curdir)/wrt350nv2-builder/compile := $(curdir)/zlib/compile
 $(curdir)/lzma-old/compile := $(curdir)/zlib/compile
 $(curdir)/make-ext4fs/compile := $(curdir)/zlib/compile
-$(curdir)/cbootimage/compile += $(curdir)/autoconf/compile
+$(curdir)/cbootimage/compile += $(curdir)/automake/compile
 
 ifneq ($(HOST_OS),Linux)
   $(curdir)/squashfskit4/compile += $(curdir)/coreutils/compile