Add UART support for STM32L1 series SoCs. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Add STM32L1 SoC series support with STM32L15XXB as the target SoC. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>