Add tee to the allowed PATH tools list

tee is used by art/build/Android.gtest.mk during testing

Change-Id: I45993366622694edef5494d9e74b8465a15a8795
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index b7128d7..7886466 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -131,6 +131,7 @@
 	"sum":       Allowed,
 	"tar":       Allowed,
 	"tail":      Allowed,
+	"tee":       Allowed,
 	"todos":     Allowed,
 	"touch":     Allowed,
 	"tr":        Allowed,