Merge pull request #203 from tkenakka/next

[rilmodem] Minor rilmodem/sim.c mem leak fix
[rilmodem] Fine-tune disconnect reasons for MO calls
Merge pull request #206 from marttipiirainen/voice_busy

[rilmodem] Fine-tune disconnect reasons for MO calls
[rilmodem] Network lock depersonalisation support

Signed-off-by: Tommi Kenakkala <tommi.kenakkala@oss.tieto.com>