rtc: pm8xxx: drop spmi error messages

Drop the unnecessary error messages after every spmi regmap access,
which are not expected to fail.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20230202155448.6715-3-johan+linaro@kernel.org


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