powerpc: ppc4xx: Move CANYONLANDS/GLACIER/ARCHES to Kconfig

Move these options to Kconfig and remove them from the CONFIG files.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/canyonlands.h b/include/configs/canyonlands.h
index 7b1f368..ed790cc 100644
--- a/include/configs/canyonlands.h
+++ b/include/configs/canyonlands.h
@@ -11,6 +11,8 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#include <linux/kconfig.h>
+
 /*-----------------------------------------------------------------------
  * High Level Configuration Options
  *----------------------------------------------------------------------*/