base-files: move urandom seed bits into separate package

So it's possible to install or remove it as needed.

Tested-by: Lucian Cristian <lucian.cristian@gmail.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/base-files/files/etc/init.d/urandom_seed

@@ -1,12 +0,0 @@
-#!/bin/sh /etc/rc.common
-
-START=99
-USE_PROCD=1
-
-start_service() {
-    procd_open_instance "urandom_seed"
-    procd_set_param command "/sbin/urandom_seed"
-    procd_set_param stdout 1
-    procd_set_param stderr 1
-    procd_close_instance
-}