Add uce service to core policy.

This service is requested by AOSP framework, but there is no context for
it defined.

Bug: 136023468
Test: N/A
Change-Id: Ibc5b048aaa1c9eda7b9180caca92cb876c3f6b28
Merged-In: Ibc5b048aaa1c9eda7b9180caca92cb876c3f6b28
(cherry picked from commit 67cb30fabf50e3ce2f08e9edd4e14214c11571a4)
3 files changed