make CallerInfo as SystemAPI

1. move CallerInfo from telephony.internal to andorid.telephony package
2. expose APIs inside CallerInfo which are consumed by non-telephony
code.

Bug: 140908357
Test: Build
Change-Id: Ie95897c77e97e40f5357c107aede82edfea44d5a
(cherry picked from commit b9a1eefe)
Merged-in: Ie95897c77e97e40f5357c107aede82edfea44d5a