Revert "Switch to toybox hostname(1)."

This reverts commit b115b81095cddc6a480057d08f4098e51271b370.

Reason for revert: http://b/123123255

Change-Id: I0f2bfebf1189fdc71e093538a8b228dd0e0b6946
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index b50748b..531c5d5 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -90,6 +90,7 @@
 	"grep":      Allowed,
 	"gzip":      Allowed,
 	"hexdump":   Allowed,
+	"hostname":  Allowed,
 	"jar":       Allowed,
 	"java":      Allowed,
 	"javap":     Allowed,
@@ -141,7 +142,6 @@
 	"expr":      Toybox,
 	"head":      Toybox,
 	"getconf":   Toybox,
-	"hostname":  Toybox,
 	"id":        Toybox,
 	"ln":        Toybox,
 	"ls":        Toybox,