vt: Correct comment documenting do_take_over_console()

vt: Correct comment documenting do_take_over_console()

Commit 3e795de7631b ("[PATCH] VT binding: Add binding/unbinding support
for the VT console") introduced a code comment claiming that
"do_take_over_console is basically a register followed by unbind".

However the function actually performs a register followed by *bind*.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Antonino A. Daplas <adaplas@gmail.com>
Link: https://lore.kernel.org/r/a500f005ba7013ca8165a6d42f59b2183d56114f.1578574427.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>