Input: cros_ec_keyb - use kobj_to_dev() API

Use kobj_to_dev() API instead of container_of().

Signed-off-by: zhouchuangao <zhouchuangao@vivo.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1624025283-56360-1-git-send-email-zhouchuangao@vivo.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>