Revert "package/initscripts: S40network: wait for network interfaces to appear"

This reverts commit 49964858. It is
going to be replaced with an ifup hook in next patch.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>