i2c: normal_i2c can be made const (rtc drivers)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Alessandro Zummo <alessandro.zummo@towertech.it>

diff --cc drivers/rtc/rtc-ds1672.c
Simple merge

diff --cc drivers/rtc/rtc-isl1208.c
Simple merge

diff --cc drivers/rtc/rtc-max6900.c
Simple merge

diff --cc drivers/rtc/rtc-pcf8563.c
Simple merge

diff --cc drivers/rtc/rtc-pcf8583.c
Simple merge

diff --cc drivers/rtc/rtc-x1205.c
Simple merge