Dialer(MSIM): Dialer app support for multisim

-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.

CRs-Fixed: 718068

Conflicts:
src/com/android/dialer/SpecialCharSequenceMgr.java
Change-Id: I9a65978ec9d6b4deba94082e2892030aca620f25