hal: stm32wbxx: Add HAL for the STM32WB series

This adds the HAL code needed for the SoC for the stm32wb series.

Origin: ST Microelectronics
License: BSD-3-Clause
URL: http://www.st.com/en/embedded-software/stm32cubewb.html


Commit: 1.0.0
Purpose: HAL layer for stm32wb
Maintained-by: External

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>