A remove callback just returning 0 is equivalent to no remove callback
at all. So drop the useless function.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20221213182125.929303-1-u.kleine-koenig@pengutronix.deSigned-off-by: Linus Walleij <linus.walleij@linaro.org>