Fixed that processing malformed PDUs stored in the intent caused crash.

The reported issue is that a malware can broadcast a DATA_SMS_RECEIVED
intent with incorrect type of PDUs. The handling function in telephony
will crash due to casting exception. The other change has already
changed DATA_SMS_RECEIVED to a proected broadcast intent so ideally
only system apps can send this intent. However, if the system app
has a bug, this crash might still happen.

bug: 22540754
Change-Id: Ifa780719b274e899bd15ac021a52506653067265