TTY: move .gitignore from drivers/char/ to drivers/tty/vt/

The autogenerated files (consolemap_deftbl.c and defkeymap.c) need to
be ignored by git, so move the .gitignore file that was doing it to the
properly location now that the files have moved as well.

Cc: Arnd Bergmann <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Alan Cox <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>