Telephony: SMS over IMS

ImsSMSDispatcher is part of IccSmsInterfaceManager.
It always receives calls to send sms first and decides
whether to use ims call flow or gsm/cdma based on response
to REQUEST_IMS_REGISTRATION_STATE.

When ims is registered and sms is supported, the request also returns
sms format to use.

In case of sms over ims failure, RIL_REQUEST_IMS_SEND_SMS sets
messageRef from RIL_SMS_RESPONSE of corresponding failed MO SMS, and
sets retry field to non-zero. If voice is available, sends
RIL_REQUEST_IMS_SEND_SMS retries with data encoded based on voice tech
available.  If voice is not available, sets retry counter to max and
skips retries and sends failure to client.

Change-Id: I7975223dcd5ac8b0a2cf5a1012219c3d8e419976