rtc: rx6110: Remove useless rx6110_remove

rx6110_remove is empty, remove it.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Link: https://lore.kernel.org/r/20191108002113.14791-1-iwamatsu@nigauri.org


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>