TelephonyManager API review changes

Addressing feedback from API review regarding resolving the Fi
TelephonyManager dependencies by Telecom. This includes removing
references to requiring permission from the doc as it's already defined
by the annotation as well as using the pre-defined constant for the
newly created permission (ACCESS_LAST_KNOWN_CELL_ID).

Bug: 321265124
Bug: 311773409
Test: m
Change-Id: Icab6baa6c4422e83db8ecd8bab64ef241c12df99