Fix ADC pins not working after deep sleep on RAK3172#15527
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Related to ARMmbed#15391 Fix ADC pins on RAK3172 to work correctly after deep sleep is enabled. * Add code to save and restore ADC registers in `hal_deepsleep` function in `targets/TARGET_STM/sleep.c`. * Add code to disable deep sleep when ADC is configured in `analogin_init` function in `targets/TARGET_STM/TARGET_STM32WL/analogin_device.c`. * Add code to enable ADC only when a measurement is needed in `adc_read` function in `targets/TARGET_STM/TARGET_STM32WL/analogin_device.c`.
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Related to #15391
Fix ADC pins on RAK3172 to work correctly after deep sleep is enabled.
hal_deepsleepfunction intargets/TARGET_STM/sleep.c.analogin_initfunction intargets/TARGET_STM/TARGET_STM32WL/analogin_device.c.adc_readfunction intargets/TARGET_STM/TARGET_STM32WL/analogin_device.c.