Update Cube version for STM32F4XX family from version: V1.14.0 to version: V1.15.0 Add support for Low Level API on stm32f4 familly Change-Id: I459b61f011ffbc2cc265f58cd3f0be8b77155fc2 Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>