control: Alias TimerType locally

This is needed for a future commit that removes the local
phosphor::util::Timer implementation.

Tested:
    Built and run through unit tests.

Change-Id: I8ea3399fec8761055d4a0d94fb9ea91fd34040ea
Signed-off-by: William A. Kennington III <wak@google.com>
3 files changed