Clean up Kconfig so each SoC just selects the specific Cortex-M implementaiton rather than having to select both CORTEX_M and CORTEX_{M0, M3, M4, etc.}. Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Add necessary kconfig and minimal device tree support for the stm32l072xz variants. Signed-off-by: Endre Karlson <endre.karlson@gmail.com>