Cache getDefaultSubscriptionId Binder calls

Use PropertyInvalidatedCache to avoid redundant
calls to SubscriptionController.getDefaultSubscriptionId
Bug: 151953109
Test: Flashed build and verified that the phone booted
and executed the cache

Merged-In: I69b178b42a49b1eda6c2e72ce21d93906ff9d281
Change-Id: I69b178b42a49b1eda6c2e72ce21d93906ff9d281
2 files changed