rtc: snvs: Use devm_add_action_or_reset() for calls to clk_disable_unprepare()

Use devm_add_action_or_reset() for calls to clk_disable_unprepare(),
which can simplify the error handling.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/1584109849-21402-1-git-send-email-Anson.Huang@nxp.com
Link: https://lore.kernel.org/r/1584233264-26025-1-git-send-email-Anson.Huang@nxp.com


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