Bug 921971 - [DSDS][FDN] Manage FDN list for both SIMs

Implemented:

AC1: I expect to have the same FDN functionality as in the single SIM implementation for each of the SIMs.
AC2: I expect to have the FDN list active only for the current default SIM for Voice
AC3: I expect SIM2 to still remember the data (though disabled) when SIM1 is the default for Voice, and vice versa.