Add support to send dtmf for SCH tone

Add methods to send/stop dtmf as per subscription.

Change-Id: Ia17a733bd6ec1cd0163024d12c021e1e21032078
CRs-Fixed: 610582
MSIM(DSDA): Add conversation sub

Add conversation sub

Change-Id: I67f508baf66ba5ebc86a4f430af739d6ba8180ba
CRs-Fixed: 659123
Telephony: Add an API for getting recipient address of SubmitPdu

There is no API to get the recipient address of submit pdu for SIM
card message. getDisplayOriginatingAddress() return null for submit
pdu, it will cause applicatoin can not get address of sent message.
Thread ID can not be created for this invalid message record.

Add an API getRecipientAddress() for SubmitPdu in SmsMessage.

Change-Id: I8b8af6002b5b309cba5383adb37275642487f1f0
CRs-Fixed: 627278
SamsungQualcommRIL: Handle ResponseCallList in our subclass

Change-Id: I25e8ae7a41070b7554697439ae8ec81c2fea2131
SamsungQualcommRIL: make isGSM protected

Change-Id: I580057791e3a37e084c870446e07195fbe3d96d0