stm32cube: Introduce STM32Cube for STM32F2xx series

With this commit we provide header and HAL/LL files for all STM32F2
SoCs.
Using STM32Cube provides generic access to all families, maximizes
code reuse across different STM32 families and helps taking benefit
of a mature SDK

Origin: STM32Cube
URL: http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-embedded-software/stm32cubef2.html
Purpose: Introduction of STM32F2xx STM32Cube definitions
and Abstraction Layers
Maintained-by: External

Original STM32Cube tree structure has been modified to a minimum
structure for a better fit into Zephyr. hal is split into 2 parts:
-driver: initially Drivers/STM32F2xx_HAL_Driver, contains HAL and LL
-soc: initially Drivers/CMSIS/Device/ST/STM32F2xx, contains stm32f2xx
socs header files

Change-Id: I78a4716d495ce3f3038a442e19a0403f0f00506c
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
108 files changed