Support old carrier config for pdp fail cause radio restart

The carrier config KEY_RESTART_RADIO_ON_PDP_FAIL_REGULAR_DEACTIVATION_BOOL
was deprecated, but we need to continue support it until it gets
removed completely.

Test: Telephony sanity tests
Bug: 111774203
Change-Id: Id096dce8a6270809d784b21ce5c4f56d923bcaf6