Revert "Revert "Switch to toybox timeout.""

This reverts commit 50e91c1a7a93077989cc590ea3878c46b3df4ba8.

Reason for revert: SIGRTMIN+2 support added.

Change-Id: I3cb251a102e427335315c4931e23a69b95253ee7
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 54006d2..d92649f 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -104,7 +104,6 @@
 	"rsync":    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,