drivers: rtc: add RTC functions and millisecond field

Add a millisecond field in the optee_rtc_time structure.

Add different APIs to manipulate optee_rtc_time structures:
rtc_is_a_leap_year(): Dete

drivers: rtc: add RTC functions and millisecond field

Add a millisecond field in the optee_rtc_time structure.

Add different APIs to manipulate optee_rtc_time structures:
rtc_is_a_leap_year(): Detects if the given year is a leap year
rtc_get_month_days(): Returns the number of day in the given month
rtc_timecmp(): Compare two time captures
rtc_diff_calendar_ms(): Returns the difference in milliseconds between
two time captures
rtc_diff_calendar_tick(): Returns the difference in number of ticks
between two time captures

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

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drivers: rtc: add RTC API

This API allows to interact with a RTC registered as the system RTC.

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@l

drivers: rtc: add RTC API

This API allows to interact with a RTC registered as the system RTC.

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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