Drop SMS that starts with VVM prefix even if the filter is not activated

If a VVM SMS is waiting before get cell connected, the order of SMS
processing and VVM setup is not deterministic. To drop SMS if matches
the pattern of VVM in such case.

Bug: 112469783
Test: unit test
Change-Id: I6610e41166a6cdc109ab456ad2cbe8b0b360ecb7