Fix to hide phone number printed in the log

The ConnectionRequest and ImsConferenceState fields may include phone
numbers and it is output to the log.
Since PII should not be printed in the log, mask it using Log.pii().

Bug: 111812270
Test: manual - Checked that phone number is not printed in the log when
receive an incoming call and make an IMS conference call.

Change-Id: I462ae7f923128a2d06d0415bcde0c779e932139f
2 files changed