ext/hal/st/lib: stm32wb hci shared ram driver

Library providing hci driver for host/controller communication
over shared RAM

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


Commit: 1.0.0
Purpose: Shared RAM driver for STM32WB
Maintained-by: External

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