CarrierPrivilegesTracker: Remove [un]registerCarrierPrivilegesListener

The interfaces have been deprecated and replaced by public APIs
TelephonyManager#[un]registerCarrierPrivilegesCallback in TM release.
All the callers of the old interfaces have been updated. It's time
to throughly clean up the old interfaces to keep code healthy.

Bug: 224871263
Test: atest FrameworksTelephonyTest
Change-Id: Ia3b2542226b3c5701c2a3939daceacc01fcba2a2
Merged-In: Ia3b2542226b3c5701c2a3939daceacc01fcba2a2
(cherry picked from commit b52dc2f2)