Add support for Bluetooth Sim Access Profile (3/4)

Server side of the Sim Access Profile. Enables a Bluetooth device
to take over control of the SIM. This is usefull in cars where the
internal antenna in the phone can have a low signal level.

For this profile to work, the RIL driver must allow for this feature
to be used, and it must provide the API needed. The API is based on
protoBuf.

This change includes some SAP test cases.

Change-Id: Ia46493383efed6b8a89ca270bdafa60fc1a150c1