Move touch(1) to toybox.

Test: treehugger
Change-Id: If31fe1fdc0150d07d5421702cbac8e142f522802
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 592c2eb..9ec1ea9 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -129,7 +129,6 @@
 	"stat":      Allowed,
 	"tar":       Allowed,
 	"timeout":   Allowed,
-	"touch":     Allowed,
 	"tr":        Allowed,
 	"unzip":     Allowed,
 	"wc":        Allowed,
@@ -171,6 +170,7 @@
 	"sleep":    Toybox,
 	"tail":     Toybox,
 	"tee":      Toybox,
+	"touch":    Toybox,
 	"true":     Toybox,
 	"uname":    Toybox,
 	"uniq":     Toybox,