[gprs] implement ofono_gprs_get_modem

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[gprs] publish ofono_gprs_get_modem

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[RILMODEM] remove gprs state faking

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[RILMODEM] style fixes

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
Merge pull request #262 from nemomobile-packages/no-fake

No fake