Mms: Fix force close once during MTBF test.

Fatal exception happens because lack of
"android.permission.MANAGE_DOCUMENTS" permission in Mms app.

Add "android.permission.MANAGE_DOCUMENTS" permission for Mms app in its
AndroidManifest.xml.

CRs-Fixed: 752265

Change-Id: I9fc2f15d458edde67ff2f66ade726b8b0537793a