[POWERPC] Kill flatdevtree.c

Now that earlier patches have switched the bootwrapper to using libfdt
for device tree manipulation, this patch removes the now unused
flatdevtree.c and related files.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/ops.h

@@ -79,7 +79,6 @@ struct loader_info {
 extern struct loader_info loader_info;
 
 void start(void);
-int ft_init(void *dt_blob, unsigned int max_size, unsigned int max_find_device);
 void fdt_init(void *blob);
 int serial_console_init(void);
 int ns16550_console_init(void *devp, struct serial_console_data *scdp);