Fix Telecom Test breakage due to Bluetooth permission change

BT code changed permissions to use Context#checkSelfPermission,
which caused Telecom unit tests to fail in setup() phase. This
caused a cascading issue where Logging sessions would be setup
bug never ended, causing Session recursion tests to fail when
the logging sessions were never previously cleaned up.

1) Fixed permission check mocking in tests.
2) Put bound on recursion in Session#toString to ensure we
do not hit this scenario.

Fixes: 186694546
Fixes: 186708966
AOSP: aosp/1690692
Test: atest TelecomUnitTests
Change-Id: Ibb4e2a86cccc50f23511f20c32b59af181301246