rtc: tps6586x: Report maximum alarm limit to rtc core

tps6586x only supports alarms up to 16,383 seconds in the future.
Report the limit to the RTC core.

Cc: Brian Norris <briannorris@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230817225537.4053865-6-linux@roeck-us.net


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