rtc: pcf8563: remove conditional compilation

Always compile pcf8563_rtc_ioctl as we are sure that CONFIG_RTC_INTF_DEV is
selected on actual kernel configurations.

Link: https://lore.kernel.org/r/20191214220259.621996-8-alexandre.belloni@bootlin.com


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