rtc: pcf85063: fix pcf85063_clkout_control

pcf85063_clkout_control reads the wrong register but then update the
correct one.

Reported-by: Janne Terho <[e-mail]>
Fixes: 8c229ab6048b ("rtc: pcf85063: Add pcf85063 clkout control to common clock framework")
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-pcf85063.c

···
 	unsigned int buf;
 	int ret;
 
-	ret = regmap_read(pcf85063->regmap, PCF85063_REG_OFFSET, &buf);
+	ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
 	if (ret < 0)
 		return ret;
 	buf &= PCF85063_REG_CLKO_F_MASK;