Add new "addedInSdk" attribute to carrier-associated apps.

Previously, the sysconfig wasn't capable of understanding
carrier-associated apps that were added after a device's initial launch
(i.e. via OTA) because the logic in CarrierAppUtils explicitly avoids
disabling such apps a second time.

Most of this change is just plumbing everything through. For now, it's
all @hide due to R API deadlines. It will be made public in S.

Bug: 154872019
Test: manual, QA, atest FrameworksTelephonyTests:CarrierAppUtilsTest
Change-Id: I530a4f73146b09879547ca2e0c26428957fef37a