Sync preferred apn and preferred apn set id

When APN db is reset to default, mPreferredSetId is set to 0 along with
the preferred db is reset to empty. However, we do have preferred
profile that's loaded from carrier config, and the preferred db should
be in sync with the mPreferredDataProfile.

Bug: 232890963
Test: manual basic + atest
Change-Id: I5784a39c7796e92c1b94412d2a10163ef1926913