drivers: stm32_rtc: add time stamping feature support

Support the time stamping features of the RTC. It is useful to generate
a timestamp whenever a particular event occurs.

Signed-off-by: Gatien C

drivers: stm32_rtc: add time stamping feature support

Support the time stamping features of the RTC. It is useful to generate
a timestamp whenever a particular event occurs.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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