telephony : Support for voicemail in TP-UDH of SMS

Added support for processing special message indication
for voice mail in TP user data header for SMS
Spec reference: 3GPP TS 23.040 V6.8.1

CPHS method does not use message count.
0xff is used to indicate unknown message count for CPHS
Ref[Adapt requirement CDR-MWI-120, TC: GSM-BTR-1-4700]

Change-Id: I893252d5cacd5c1c8680a8ca6c3a6dba95ef3e1f
(cherry picked from commit ce64a3c4a4cd98931ae888dc3f6c45570bbc78f5)
(cherry picked from commit 3cc432cc2d3f8c44884ddc27b781d1a4e4d68c27)
(cherry picked from commit 9e80253570db3c519a26154a49461ba4a7f27f02)