rtc: isl12022: drop a dev_info()

This dev_info() seems to be a debug leftover, and it would only get
printed once (or, once per battery change).

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20220921114624.3250848-4-linux@rasmusvillemoes.dk


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