Enforce new permission requirements for getLine1Number

To move READ_PHONE_STATE from a runtime permission to a normal
permission all sensitive APIs guarded by READ_PHONE_STATE must be
moved to another permission. This commit updates the TelecomServiceImpl
to enforce the new permission requirements for getLine1Number for apps
targeting R+ while still supporting the previous READ_PHONE_STATE for
apps targeting previous SDK versions.

Bug: 136160623
Test: atest TelecomUnitTests:TelecomServiceImplTest
Change-Id: I521c1e59f310819c42fe2699231f6a3f62cbf37f