[rilmodem] Fix answer and hangup in multiple-call scenarios

Signed-off-by: Martti Piirainen <martti.piirainen@oss.tieto.com>
Merge pull request #76 from marttipiirainen/waiting

[rilmodem] Fix answer and hangup in multiple-call scenarios
Merge pull request #77 from jkangas/master

Request for pulling listening only network and ofono core status to set ofono attached to main branch
gril: prepare set_write_handler for multi-request
gril: provide multi-request support
Merge pull request #78 from jpoutiai/master

provide multi-request support for rilmodem
rilmodem: fixes possible segfault issue in USSD
Merge pull request #79 from jpoutiai/master

rilmodem: fixes possible segfault issue in USSD
[rilmodem] Set service class to 0 in call waiting query

Set service class to 0 in call waiting query as certain
operators can reject the query with specific service class

Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
rilmodem: cancel USSD + minor style fix

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
Merge pull request #80 from ptakalok/master

[rilmodem] Set service class to 0 in call waiting query
Merge pull request #81 from jpoutiai/master

rilmodem: cancel USSD + minor style fix
gril:fix queue removing in cancel group + style fixes

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[rilmodem] Add support for RIL_REQUEST_SCREEN_STATE request

Support for RIL_REQUEST_SCREEN_STATE request will decrease power
consumption as RILD will notify the baseband to suppress certain
notifications (eg. signal strength and changes in LAC/CID, etc.).
Implementation listens to MCE's "display_status_ind" DBus signal for
sending  RIL_REQUEST_SCREEN_STATE.

Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
Merge pull request #82 from jpoutiai/master

gril:fix queue removing in cancel group + style fixes
Merge pull request #83 from ptakalok/master

[rilmodem] Add support for RIL_REQUEST_SCREEN_STATE request
sim: fix ofono crash when pin is blocked

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[rilmodem] Support for voice mailbox

Add support for voice mailbox (CPHS and MBDN). Enables speed dial to
voice mailbox from dialer and importing voice mailbox number to Settings
application.

Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
Merge pull request #84 from jpoutiai/master

sim: fix ofono crash when pin is blocked
Merge pull request #85 from ptakalok/master

[rilmodem] Support for voice mailbox