Allowing to change the poll state even if only PS is avairable on the network.

There are some MVNO operators are shipping the data only SIM. It isn't
connectable with CS, but wroks for PS. If the poll is not shown on the
system bar when network registration returns STATE_OUT_OF_SERVICE for
CS, user doesn't notice whether or not they can use PS. In addition,
PS might works while CS restriction.

Bug: 3339315
Change-Id: I6c2b508a181afed6dc9356b99ad9ef09f8c7ea4f