[POWERPC] bootwrapper: Add ft_find_device_rel().

Add a function to look up a relative, rather than absolute, path name.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/boot/flatdevtree.h b/arch/powerpc/boot/flatdevtree.h
index b9cd9f6..1f37ca2 100644
--- a/arch/powerpc/boot/flatdevtree.h
+++ b/arch/powerpc/boot/flatdevtree.h
@@ -97,6 +97,8 @@
 void ft_dump_blob(const void *bphp);
 void ft_merge_blob(struct ft_cxt *cxt, void *blob);
 void *ft_find_device(struct ft_cxt *cxt, const char *srch_path);
+void *ft_find_device_rel(struct ft_cxt *cxt, const void *top,
+                         const char *srch_path);
 void *ft_find_descendent(struct ft_cxt *cxt, void *top, const char *srch_path);
 int ft_get_prop(struct ft_cxt *cxt, const void *phandle, const char *propname,
 		void *buf, const unsigned int buflen);