build/configs/stm32l4r9ai-disco: Enable STM32L4_RTC config
build/configs/stm32l4r9ai-disco: Enable STM32L4_RTC config

Change-Id: I9a0bbefc6681fe8235b4ff8bce73449cc230d57b
Signed-off-by: Nitish Ambastha <fe3fdc39e03194843ec106698f0d3de8d8813ae6@samsung.com>

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