cinterion: fix EPS
Defaults the Bearer Auth to 'none' if auth, user and password is not set. This allows mmcli -m Modem --3gpp-set-initial-eps-bearer-settings=""
to work properly.
Also if I'm correct, we should use the AT+CGCONTRDP
command during runtime and AT+CGDCONT?
if not, not the other way around.
ctx->runtime
is TRUE
when calling modem_3gpp_load_initial_eps_bearer()
(use AT+CGCONTRDP
here) and FALSE
when calling modem_3gpp_load_initial_eps_bearer_settings()
(use AT+CGDCONT?
here).