toolbox: swap utils

Add swap utilities (mkswap, swapon, swapoff) to the toolbox

Change-Id: If5ed6981670a1cdda6b528b587dbc1be7ccdf832
Signed-off-by: Rom Lemarchand <romlem@google.com>
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index 565ec2a..f60037d 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -65,7 +65,10 @@
 	runcon \
 	getsebool \
 	setsebool \
-	load_policy
+	load_policy \
+	swapon \
+	swapoff \
+	mkswap
 
 ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
 TOOLS += r