Un-obscure the Telephony phone account ID.

With the upcoming changes in T to move telephony phone account handles to
use subid instead of ICCID, the id of telephony phone account handles
no longer needs to be Log.pii-ed.  These phone accounts have been hard to
diagnose in most bug reports due to the obfuscation.

Bug: 226972613
Test: Manual testing; place calls and verify Telephony account handles are now visible.
Change-Id: I5ff66571658c2b81b83e3f7d1936e3e805598769