Add a PACKAGECONFIG that can be used to set the idle-time to 0. This is
useful for always on machine (such as kiosks) and for debugging.
(From OE-Core rev: 082902a3e97020f0b02097feb3c2173c64a017bf)
Signed-off-by: Alistair Francis <alistair@alistair23.me>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>