New system API to create SMS PDU and expose copyMessageToIcc()

Expose copyMessageToIcc() with ACCESS_MESSAGES_ON_ICC permission and new
getSmsPdu() and getDeliverPdu() for both 3GPP and 3GPP2 are added for
use by TelephonyProvider.
It includes cleanup documentations for SMSC and getSubmitPdu() as well.

Test: Manual

Change-Id: I0bed6a961412c89025d5c70f59fef5cd163cbfbf
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>