Divide a message text into correctly sized parts

Message format info is required in order to divide a message text into
correctly sized parts on a device that supports for both 3GPP and 3GPP2
formats in multi-sim. And fixed to get default SMS subId from SmsManager
in SmsMessage class instead.

Test: Manual

Change-Id: Id2512eb62504b7e789f58b7d9697009d565c4a18
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>