Add mknod utility to system/core/toolbox

Change-Id: I46586cba83ecb8095721be8ffad9e386d4698e4a
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index 6bac5f5..c53f17d 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -33,6 +33,7 @@
 	lsof \
 	md5 \
 	mkdir \
+	mknod \
 	mkswap \
 	mount \
 	mv \