Add support for integrating call composer

* Minor bugfix in call log to handle USER_CURRENT
* add TelephonyLocalConnection that allows frameworks/opt/telephony to
call code (indirectly) in packages/services/Telephony

Bug: 177613111
Test: atest CallComposerTest

Merged-In: I602b51da6009c884364a026781ca3c160978fbd1
Change-Id: I61af7553b4b3d71fe87c86fca62941747d43ef55