cmds/cpu: remove termios calls in main()
cmds/cpu: remove termios calls in main()

Now that the u-root termios pkg is fixed as of b0da363052a2724a46a72ec11d323e6f646529a9,
we no longer need the calls in cpu.go to get and reset the terminal.

Signed-off-by: Ronald G. Minnich <f569d0af9a3481c4007b95c7180d6c41009f2513@gmail.com>

u-root/cpu,u-root/cpu,u-root/cpu