MMS: Share a mp3 file via mms

There is no audio type intent-filter in the Mms AndroidManifest.xml.
So there is no Mms in the choose dialog when user share a mp3 through
file-explorer.

Add audio type intent-filter in Mms AndroidManifest.xml.

CRs-Fixed: 496760

Change-Id: I6c635433840b31b6a4fe725962b5a56d6a187949