busybox: remove busybox-udhcpc-no_deconfig.patch

busybox: remove busybox-udhcpc-no_deconfig.patch

The option was introduced in:
https://git.yoctoproject.org/poky/commit/?h=master&id=427472e980cd6254a5e4ef37209b327e15af259b
for the purpose of a standalone udhcpc service.

18 months later the service was removed as it was clashing with the
broader networking service, and the option isn't used
anywhere else:
https://git.yoctoproject.org/poky/commit/?h=master&id=a4b1e348484b74d055b8906413892789d3452f4a

There's a slight chance the option still survives
somewhere private, and is important in that context,
but I'd rather drop the patch so it can be maintained
where it's useful, and maybe even proposed upstream.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>