Include the STM32Cube_FW to support the BLE of the stm32wb55

Only in case STM32WBxx device defined

Signed-off-by: Francois Ramu <francois.ramu@st.com>

Author: FRASTM

src/utility/STM32Cube_FW/README.md

@@ -0,0 +1,6 @@
+
+## Source
+
+[STMicroelectronics/STM32CubeWB Release v1.8.0](https://github.com/STMicroelectronics/STM32CubeWB/releases/tag/v1.8.0)
+- Application: [BLE_TransparentMode](https://github.com/STMicroelectronics/STM32CubeWB/tree/v1.8.0/Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_TransparentMode)
+