drivers: rtc: rpi_pico: Add support for the Raspberry Pi Pico RTC #103623

Job	Run time
twister-build-prep	1m 59s
twister-build (1)	42m 31s
twister-build (2)	35m 35s
twister-build (3)	37m 43s
twister-build (4)	22m 11s
twister-build (5)	39m 18s
Publish Unit Tests Results	17s
Check Twister Status / all jobs passed	1s
	2h 59m 35s

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