rtc: rx8025: Remove struct i2c_client from struct rx8025_data

rtc: rx8025: Remove struct i2c_client from struct rx8025_data

struct i2c_client can be referenced from the device structure, so this
doesn't need to have it in struct rx8025_data.
Remove struct i2c_client from struct rx8025_data.

CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Alexandre Belloni <alexandre.belloni@bootlin.com>
CC: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Link: https://lore.kernel.org/r/20191218081624.3307752-1-iwamatsu@nigauri.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>