rtc: pcf2127: add UIE support for PCF2131

The PCF2127/29 do NOT support alarms with a 1 second resolution, but
the PCF2131 does.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20230622145800.2442116-17-hugo@hugovil.com


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