toybox and toolbox should be considered equivalent.

When toolbox completely disappears, we can worry about whether we want
to rename this context.

Change-Id: I359b6b2b21bb9452352e700f6ac37c137200ac77

file_contexts

@@ -128,6 +128,7 @@
 /system/bin/e2fsck	--	u:object_r:fsck_exec:s0
 /system/bin/fsck\.f2fs	--	u:object_r:fsck_exec:s0
 /system/bin/toolbox	--	u:object_r:toolbox_exec:s0
+/system/bin/toybox	--	u:object_r:toolbox_exec:s0
 /system/bin/logcat	--	u:object_r:logcat_exec:s0
 /system/bin/sh		--	u:object_r:shell_exec:s0
 /system/bin/run-as	--	u:object_r:runas_exec:s0