kernel - Fix panic when X11 intercepts console (III)

kernel - Fix panic when X11 intercepts console (III)

* Oops, ripped a little too much out of kputchar().  Put the TOTTY
  logic back in for the tprintf()/uprintf()/ttyprintf() cases.

* The console logic remains unchanged for kprintf() (it no longer
  attempts to tputchar() to a console tty intercept, instead we have
  a thread handle it from the dmesg buffer).