Switch to toybox timeout.

Test: treehugger
Change-Id: Ieea84deac5d0ccef0f3d4949aa1ba870d406e482
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 4a30391..e494042 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -105,7 +105,6 @@
 	"sed":      Allowed,
 	"sh":       Allowed,
 	"tar":      Allowed,
-	"timeout":  Allowed,
 	"tr":       Allowed,
 	"unzip":    Allowed,
 	"zip":      Allowed,
@@ -166,6 +165,7 @@
 	"stat":      LinuxOnlyPrebuilt,
 	"tail":      LinuxOnlyPrebuilt,
 	"tee":       LinuxOnlyPrebuilt,
+	"timeout":   LinuxOnlyPrebuilt,
 	"touch":     LinuxOnlyPrebuilt,
 	"true":      LinuxOnlyPrebuilt,
 	"uname":     LinuxOnlyPrebuilt,