tty: Use static attribute groups for sysfs entries

Instead of manual calls of device_create_file() and
device_remove_file(), pass the static attribute groups using
device_create_with_groups().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/tty/tty_io.c
Simple merge

diff --cc drivers/tty/vt/vt.c
Simple merge