wpa-supplicant: backport patch to fix dbus interface for autoscan functionality

wpa-supplicant: backport patch to fix dbus interface for autoscan functionality

See https://lists.connman.net/pipermail/connman/2013-July/014871.html for details about
the issue with connman and http://lists.shmoo.com/pipermail/hostap/2013-July/028167.html
about the upstream submission of the patch.

(From OE-Core rev: 0d045e401bbd6a5ebf31a25e333fccc5a529f8cb)

Signed-off-by: Simon Busch <morphis@gravedo.de>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>