Strings for pSIM on/off toggle removal

We need to remove the on/off toggle for pSIMs because of unexpected
problems in the telephony stack with being able to disable a pSIM. These
new strings are used in the updated UX we're adding to deal with this.

Bug: 132921553
Test: n/a
Change-Id: I60816289e0ef65bbf882a8dca6f08c46742bb1c9