Add toybox seq.

Bug: https://issuetracker.google.com/129992021
Test: builds
Change-Id: I63d5b3fd1c71b771e995638094ee4310435105ee
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index fb30f85..ed2d9ca 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -155,6 +155,7 @@
 	"rm":        LinuxOnlyPrebuilt,
 	"rmdir":     LinuxOnlyPrebuilt,
 	"sed":       LinuxOnlyPrebuilt,
+	"seq":       LinuxOnlyPrebuilt,
 	"setsid":    LinuxOnlyPrebuilt,
 	"sha1sum":   LinuxOnlyPrebuilt,
 	"sha256sum": LinuxOnlyPrebuilt,