stm32cube: Add Zephyr build system files for stm32f3 series

Change-Id: I5c2de9d5814644855ed4a691fa1712ebd294ca64
Signed-off-by: Adam Podogrocki <adam.podogrocki@rndity.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2 files changed