drivers: counter: stm32: rtc: remove init struct

Remove the calls to LL_RTC_Init, LL_RTC_DeInit and LL_RTC_ALMA_Init in
the RTC counter driver. This avoids calling functions from
stm32xxxx_ll_rtc.c.
They are replaced by a set of simpler functions from the header file.

Signed-off-by: Guillaume Gautier <[email protected]>

Author: gautierg-st

drivers/counter/Kconfig.stm32_rtc

@@ -8,7 +8,6 @@ menuconfig COUNTER_RTC_STM32
 	default y if !RTC
 	depends on DT_HAS_ST_STM32_RTC_ENABLED
 	depends on !SOC_SERIES_STM32WB0X
-	select USE_STM32_LL_RTC
 	help
 	  Build RTC driver for STM32 SoCs.
 	  Tested on STM32 C0, F0, F2, F3, F4, F7, G0, G4, H7, L1, L4, L5, U5 series