Mms: Mms could save ogg format attachment

The ogg file is not regard as an audio file because ogg format
file's content type is 'application/ogg', which is different
from standard one which start with 'audio/'.

Add extra judgement for ogg file supports.

CRs-Fixed: 506771

Change-Id: I64dc0d927b52fc1bdcbb22b200625f389b7c1bad