Add APIs for updating, query 5G slicing status

Test: atest DevicePolicyManagerTest
Bug: 178655595
Change-Id: I6f823be6737f7c7b3dc918230cbb927fac97c6eb
Merged-In: I6f823be6737f7c7b3dc918230cbb927fac97c6eb
(cherry picked from commit 1f4ea44b5fc2a4aa7d2ad438dad16f8c8a81f175)
8 files changed