ril: initial data connection bringup

Signed-off-by: Lukas Märdian <lukas@goldelico.com>
ril: fix gprs permission problems, using ifc_* calls

Signed-off-by: Lukas Märdian <lukas@goldelico.com>
confix.xml: little cleanup

Signed-off-by: Lukas Märdian <lukas@goldelico.com>