Dialer(MSIM): Dialer app support for multisim

-Call Settings support for multisim.
  Use MSimCallFeaturesSetting class to provide all
  subscription specific Call settings access to user.

-Add support to handle the following commands/request on
 voice preferred subscription for multisim
 1) ADN entry MMI commands.
 2) Voicemail dial request.
 3) PIN/PUK MMI commands.

-Add voice mail subscription prompt for multisim:
 When prompt option is enabled in MultiSIM settings,
 check for the voicemail number on all subs and allow
 voice mail request if at least one sub has voice mail
 number associated with it.

Change-Id: I9a65978ec9d6b4deba94082e2892030aca620f25
(cherry picked from commit 0efb798979072e45d4c36dcfecf1951442312df4)
(cherry picked from commit 60ee2e5b8c37e45529131d25cd9c542921e323ce)