iface-mode-simple: when setting bands or modes, wait some time to settle down

When bands or allowed modes are changed, the modem will very likely reset its
current registration and start from scratch. We will now give it some seconds
to settle down before going on with the connection request, so that the modem
has enough time to report being unregistered. Without this sleep time, the
unsolicited message reporting being unregistered may arrive *after* having
checked registration status in the Simple connect sequence, and therefore we
end up failing the connection request.

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