MSIM: Fix user set DDS sub in hotswap cases.

Currently if user set DDS sim is removed and inserted,
dds will not fallback to user preferred sub.

Fix: Save the user preferred DDS sub in DB and set it
as DDS sub, when sim is removed and inserted.

Change-Id: Ic34fdbad70a7dc99a0fa5de9cbb9d24caa6bac87
CRs-Fixed: 958445