UwbService: Enforce UWB_PRIVILEGED permission

This API surface is directly accessible only to a select set of system
apps which hold the UWB_PRIVILEGED permission.

Bug: 183904955
Test: atest android.uwb.cts.UwbManagerTest
Change-Id: I27e752c37b75e3dd8bf7990b71333b97197f478f
2 files changed