dnsmasq: fix dhcp "ignore" option on wwan interfaces

dnsmasq: fix dhcp "ignore" option on wwan interfaces

Init script won't append --no-dhcp-interface option if interface
protocol is one of: ncm, directip, qmi, mbim.
This is caused by IP address assigned to dynamically created netifd
interfaces. As a result there's no netmask assigned to the main
interface and dhcp_add() function returns prematurely.

By moving network subnet check we can ensure that --no-dhcp-interface is
properly generated for wwan interfaces.

Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase; move network checks]