Add Dialer secret codes.

- Added *#*#823241#*#* (TCDBG1) to enable verbose logging (does not log
pii).
Logging enabled for 30 minutes and then it automatically reverts back to
regular log level.
- Added *#*#823240#*#* (TCDBG0) to disable verbose logging (when previously
set).
- Added *#*#826275#*#* (TCMARK) to add a "MARK" in the call log; this is
so that a user can immediately make a mark in the call log so that it is
easier for someone debugging a bug report to know when the problem
happened.

Bug: 20852653
Change-Id: I2cb6c944085efd78a05c4adf56a900ae0b05186f