toolbox: Add nandread command

Extracts a nand image from an mtd partition with page data followed by
64 bytes of extra data.
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index 70b13dc..122a544 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -50,7 +50,8 @@
 	top \
 	iftop \
 	id \
-	vmstat
+	vmstat \
+	nandread
 
 LOCAL_SRC_FILES:= \
 	toolbox.c \