Fix DDS switch issues for CDMA and IWLAN scenarios.

Maintain data allowed flags for each phone, based on the
current DDS switch scenerio. Ignore ATTACHed event in DcSSM
IdleState, if data is not allowed on that phone.
This helps to prevent unnecessary ALLOW_DATA(T) requests
when CDMA or IWLAN data registration is reported after PS
detach is initiated for the phone. It also helps to avoid
wrong DDS switch in case of race condition between PS detach
and data registration indication.

Change-Id: I4bb1923e39182dd3df80207fcd6841273c67d75c
CRs-Fixed: 986052