Add a symlink for tty(1).

It's POSIX and I find myself using it a surprising amount for debugging,
especially adb. (And, as long as our ps is non-standard, you can't just
type "ps" to see what tty you're on.)

Change-Id: I45aae330f0e6bfbd90829005f199b44bb9aa3c50
1 file changed