rtc: pm8xxx: rename struct device pointer

Rename the driver-data struct device pointer by dropping the "rtc"
prefix which is both redundant and misleading (as this is a pointer to
the platform device and not the rtc class device).

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: David Collins <quic_collinsd@quicinc.com>
Link: https://lore.kernel.org/r/20230202155448.6715-10-johan+linaro@kernel.org


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