Add SMS processing support

Signed-off-by: Simon Busch <morphis@gravedo.de>
Send a update to subscribers when network registration is lost

Signed-off-by: Simon Busch <morphis@gravedo.de>
Fix a lot not correctly implemented things

Signed-off-by: Simon Busch <morphis@gravedo.de>
ofono: wan: also include IP address in status report

Signed-off-by: Simon Busch <morphis@gravedo.de>
Finish SMS implementation

Now we have incoming and outgoing SMS support working.

Signed-off-by: Simon Busch <morphis@gravedo.de>