Make remaining UCE related APIs @SystemApi

Bug: 111305845
Bug: 147613952
Test: atest CtsTelephonyTestCases
Merged-In: I8fed782e7bef10d6d136fce02e6f1b59d225272b
Change-Id: I8fed782e7bef10d6d136fce02e6f1b59d225272b
15 files changed